--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ strace-4.6/Makefile:
 
 clean:
 	cd readelf-mini && make clean
-	cd strace-4.6 && make clean
+	-cd strace-4.6 && make clean
 	rm -f cde cde-exec okapi
 
 okapi: strace-4.6/okapi.c strace-4.6/okapi.h
