diff --git a/src/Text/Pandoc/Writers/ICML.hs b/src/Text/Pandoc/Writers/ICML.hs
index f42d26614..08e3e5b63 100644
--- a/src/Text/Pandoc/Writers/ICML.hs
+++ b/src/Text/Pandoc/Writers/ICML.hs
@@ -251,6 +251,13 @@ charStylesToDoc st = vcat $ map makeStyle $ Set.toAscList $ inlineStyles st
                          else empty
       in  inTags True "CharacterStyle" ([("Self", "CharacterStyle/"++s), ("Name", s)] ++ attrs') props
 
+-- | Escape colon characters as %3a
+escapeColons :: String -> String
+escapeColons (x:xs)
+  | x == ':' = "%3a" ++ escapeColons xs
+  | otherwise = x : escapeColons xs
+escapeColons []     = []
+
 -- | Convert a list of (identifier, url) pairs to the ICML listing of hyperlinks.
 hyperlinksToDoc :: Hyperlink -> Doc
 hyperlinksToDoc []     = empty
@@ -259,13 +266,13 @@ hyperlinksToDoc (x:xs) = hyp x $$ hyperlinksToDoc xs
     hyp (ident, url) = hdest $$ hlink
       where
         hdest = selfClosingTag "HyperlinkURLDestination"
-                  [("Self", "HyperlinkURLDestination/"++url), ("Name","link"), ("DestinationURL",url), ("DestinationUniqueKey","1")]
+                  [("Self", "HyperlinkURLDestination/"++(escapeColons url)), ("Name","link"), ("DestinationURL",url), ("DestinationUniqueKey","1")] -- HyperlinkURLDestination with more than one colon crashes CS6
         hlink = inTags True "Hyperlink" [("Self","uf-"++show ident),  ("Name",url),
                     ("Source","htss-"++show ident), ("Visible","true"), ("DestinationUniqueKey","1")]
                   $ inTags True "Properties" []
                   $ inTags False "BorderColor" [("type","enumeration")] (text "Black")
                   $$ (inTags False "Destination" [("type","object")]
-                  $ text $ "HyperlinkURLDestination/"++(escapeStringForXML url))
+                  $ text $ "HyperlinkURLDestination/"++(escapeColons (escapeStringForXML url))) -- HyperlinkURLDestination with more than one colon crashes CS6
 
 
 -- | Convert a list of Pandoc blocks to ICML.
diff --git a/tests/writer.icml b/tests/writer.icml
index 26795df58..b6f5b5e32 100644
--- a/tests/writer.icml
+++ b/tests/writer.icml
@@ -2717,39 +2717,39 @@ These should not be escaped:  \$ \\ \&gt; \[ \{</Content>
 </ParagraphStyleRange>
 
   </Story>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/http://google.com" Name="link" DestinationURL="http://google.com" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/http%3a//google.com" Name="link" DestinationURL="http://google.com" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-31" Name="http://google.com" Source="htss-31" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/http://google.com</Destination>
+      <Destination type="object">HyperlinkURLDestination/http%3a//google.com</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/http://example.com/" Name="link" DestinationURL="http://example.com/" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/http%3a//example.com/" Name="link" DestinationURL="http://example.com/" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-30" Name="http://example.com/" Source="htss-30" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/http://example.com/</Destination>
+      <Destination type="object">HyperlinkURLDestination/http%3a//example.com/</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/mailto:nobody@nowhere.net" Name="link" DestinationURL="mailto:nobody@nowhere.net" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/mailto%3anobody@nowhere.net" Name="link" DestinationURL="mailto:nobody@nowhere.net" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-29" Name="mailto:nobody@nowhere.net" Source="htss-29" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/mailto:nobody@nowhere.net</Destination>
+      <Destination type="object">HyperlinkURLDestination/mailto%3anobody@nowhere.net</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/http://example.com/" Name="link" DestinationURL="http://example.com/" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/http%3a//example.com/" Name="link" DestinationURL="http://example.com/" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-28" Name="http://example.com/" Source="htss-28" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/http://example.com/</Destination>
+      <Destination type="object">HyperlinkURLDestination/http%3a//example.com/</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/http://example.com/?foo=1&amp;bar=2" Name="link" DestinationURL="http://example.com/?foo=1&amp;bar=2" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/http%3a//example.com/?foo=1&amp;bar=2" Name="link" DestinationURL="http://example.com/?foo=1&amp;bar=2" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-27" Name="http://example.com/?foo=1&amp;bar=2" Source="htss-27" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/http://example.com/?foo=1&amp;bar=2</Destination>
+      <Destination type="object">HyperlinkURLDestination/http%3a//example.com/?foo=1&amp;bar=2</Destination>
     </Properties>
   </Hyperlink>
   <HyperlinkURLDestination Self="HyperlinkURLDestination//script?foo=1&amp;bar=2" Name="link" DestinationURL="/script?foo=1&amp;bar=2" DestinationUniqueKey="1" />
@@ -2766,18 +2766,18 @@ These should not be escaped:  \$ \\ \&gt; \[ \{</Content>
       <Destination type="object">HyperlinkURLDestination//script?foo=1&amp;bar=2</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/http://att.com/" Name="link" DestinationURL="http://att.com/" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/http%3a//att.com/" Name="link" DestinationURL="http://att.com/" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-24" Name="http://att.com/" Source="htss-24" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/http://att.com/</Destination>
+      <Destination type="object">HyperlinkURLDestination/http%3a//att.com/</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/http://example.com/?foo=1&amp;bar=2" Name="link" DestinationURL="http://example.com/?foo=1&amp;bar=2" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/http%3a//example.com/?foo=1&amp;bar=2" Name="link" DestinationURL="http://example.com/?foo=1&amp;bar=2" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-23" Name="http://example.com/?foo=1&amp;bar=2" Source="htss-23" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/http://example.com/?foo=1&amp;bar=2</Destination>
+      <Destination type="object">HyperlinkURLDestination/http%3a//example.com/?foo=1&amp;bar=2</Destination>
     </Properties>
   </Hyperlink>
   <HyperlinkURLDestination Self="HyperlinkURLDestination//url/" Name="link" DestinationURL="/url/" DestinationUniqueKey="1" />
@@ -2857,11 +2857,11 @@ These should not be escaped:  \$ \\ \&gt; \[ \{</Content>
       <Destination type="object">HyperlinkURLDestination/</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/mailto:nobody@nowhere.net" Name="link" DestinationURL="mailto:nobody@nowhere.net" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/mailto%3anobody@nowhere.net" Name="link" DestinationURL="mailto:nobody@nowhere.net" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-11" Name="mailto:nobody@nowhere.net" Source="htss-11" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/mailto:nobody@nowhere.net</Destination>
+      <Destination type="object">HyperlinkURLDestination/mailto%3anobody@nowhere.net</Destination>
     </Properties>
   </Hyperlink>
   <HyperlinkURLDestination Self="HyperlinkURLDestination//url/with_underscore" Name="link" DestinationURL="/url/with_underscore" DestinationUniqueKey="1" />
@@ -2913,11 +2913,11 @@ These should not be escaped:  \$ \\ \&gt; \[ \{</Content>
       <Destination type="object">HyperlinkURLDestination//url/</Destination>
     </Properties>
   </Hyperlink>
-  <HyperlinkURLDestination Self="HyperlinkURLDestination/http://example.com/?foo=1&amp;bar=2" Name="link" DestinationURL="http://example.com/?foo=1&amp;bar=2" DestinationUniqueKey="1" />
+  <HyperlinkURLDestination Self="HyperlinkURLDestination/http%3a//example.com/?foo=1&amp;bar=2" Name="link" DestinationURL="http://example.com/?foo=1&amp;bar=2" DestinationUniqueKey="1" />
   <Hyperlink Self="uf-3" Name="http://example.com/?foo=1&amp;bar=2" Source="htss-3" Visible="true" DestinationUniqueKey="1">
     <Properties>
       <BorderColor type="enumeration">Black</BorderColor>
-      <Destination type="object">HyperlinkURLDestination/http://example.com/?foo=1&amp;bar=2</Destination>
+      <Destination type="object">HyperlinkURLDestination/http%3a//example.com/?foo=1&amp;bar=2</Destination>
     </Properties>
   </Hyperlink>
   <HyperlinkURLDestination Self="HyperlinkURLDestination//url" Name="link" DestinationURL="/url" DestinationUniqueKey="1" />