diff --git a/src/Makefile b/src/Makefile
index 5891d49..8f865bb 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -20,7 +20,7 @@ imdb_1to2: imdb_1to2.c
 
 clean:
 	rm -f *.o
-	rm -f imdb_*to*
+	rm -f imdb_?to?
 	rm -f util
 	rm -f util-static
 	rm -f libimgdup*