diff --git a/src/Text/Pandoc/Writers/Powerpoint/Output.hs b/src/Text/Pandoc/Writers/Powerpoint/Output.hs
index d83fb2182..a28eaf54c 100644
--- a/src/Text/Pandoc/Writers/Powerpoint/Output.hs
+++ b/src/Text/Pandoc/Writers/Powerpoint/Output.hs
@@ -1981,7 +1981,7 @@ presentationToPresentationElement pres@(Presentation _ slds) = do
notesMasterElem = mknode "p:notesMasterIdLst" []
[ mknode
- "p:NotesMasterId"
+ "p:notesMasterId"
[("r:id", "rId" <> tshow notesMasterRId)]
()
]
diff --git a/test/pptx/blanks/just-speaker-notes/deleted-layouts.pptx b/test/pptx/blanks/just-speaker-notes/deleted-layouts.pptx
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diff --git a/test/pptx/speaker-notes-afterseps/deleted-layouts.pptx b/test/pptx/speaker-notes-afterseps/deleted-layouts.pptx
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