diff --git a/qucs/qucs/Makefile.am b/qucs/qucs/Makefile.am
index b50d73e7bf..57b36b4eec 100644
--- a/qucs/qucs/Makefile.am
+++ b/qucs/qucs/Makefile.am
@@ -143,6 +143,6 @@ if COND_WIN32
 doesnotexist.log: SH_LOG_FLAGS=-c 'exit 77'
 endif
 
-CLEANFILES = *~ *.rej *.orig
+CLEANFILES = *~ *.rej *.orig qucs_.cpp
 MAINTAINERCLEANFILES = Makefile.in *.moc.cpp *.qm
 DISTCLEANFILES = *.moc.cpp *.qm