diff --git a/windows/pandoc-setup.iss b/windows/pandoc-setup.iss
index 41f9bbe2f..c6cf5bce4 100644
--- a/windows/pandoc-setup.iss
+++ b/windows/pandoc-setup.iss
@@ -6,6 +6,8 @@
 ; Do not use the same AppId value in installers for other applications.
 ; (To generate a new GUID, click Tools | Generate GUID inside the IDE.)
 AppId={{3CEE7B38-B19D-4980-9CAD-DF53600BD4CA}
+; Version 5.1 is XP
+MinVersion=5.1,5.1
 AppName=Pandoc
 AppVerName=Pandoc 1.9.1.1
 AppPublisher=John MacFarlane