diff --git a/ext/qt/Makefile.am b/ext/qt/Makefile.am
index eb0b79dcab..053a83fdde 100644
--- a/ext/qt/Makefile.am
+++ b/ext/qt/Makefile.am
@@ -42,7 +42,7 @@ libgstqtsink_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
 
 
 $(moc_generated): moc_%.cc: %.h
-	@MOC@ -o $@ $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(MOC_CPPFLAGS) $<
+	@MOC@ -o $@ $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(MOC_CPPFLAGS) $<
 
 ui-%.h: %.ui
 	@UIC@ -o $@ $<