diff --git a/src/frontends/qt4/Makefile.am b/src/frontends/qt4/Makefile.am
index 4a9cb4fdb7..55f25f404e 100644
--- a/src/frontends/qt4/Makefile.am
+++ b/src/frontends/qt4/Makefile.am
@@ -254,6 +254,7 @@ UIFILES = \
 	ChangesUi.ui \
 	CharacterUi.ui \
 	CitationUi.ui \
+	CompareUi.ui \
 	DelimiterUi.ui \
 	DocumentUi.ui \
 	ErrorListUi.ui \