diff --git a/src/Makefile.am b/src/Makefile.am
index 47683f99..4257fede 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -106,6 +106,7 @@ fluxbox_SOURCES = AtomHandler.hh ArrowButton.hh ArrowButton.cc \
 	TextTheme.hh TextTheme.cc \
 	BorderTheme.hh BorderTheme.cc \
 	CommandDialog.hh CommandDialog.cc SendToMenu.hh SendToMenu.cc \
+	CompareWindow.hh \
 	${newwmspec_SOURCE} ${gnome_SOURCE} \
 	${REMEMBER_SOURCE} ${REGEXP_SOURCE} ${TOOLBAR_SOURCE}