diff --git a/Makefile b/Makefile
index e81f92bd..b4751a43 100644
--- a/Makefile
+++ b/Makefile
@@ -18,6 +18,6 @@ clean:
 	cd asoft_presenter && make clean
 	cd dos33fs-utils && make clean
 	cd hgr-utils && make clean
-	rm *~
+	rm -f *~
 
 test:
diff --git a/ksp/Makefile b/ksp/Makefile
index 6533caeb..6c20d319 100644
--- a/ksp/Makefile
+++ b/ksp/Makefile
@@ -95,4 +95,4 @@ VAB.HGR:	vab.pcx
 	$(PCX2HGR) vab.pcx > VAB.HGR
 
 clean:	
-	rm -f *~ *.HGR
+	rm -f *~ *.HGR *.SHAPE