diff --git a/lib/sl/slc-gram.y b/lib/sl/slc-gram.y
index 8622c72fd..17dfb8238 100644
--- a/lib/sl/slc-gram.y
+++ b/lib/sl/slc-gram.y
@@ -759,5 +759,6 @@ main(int argc, char **argv)
 	fclose(cfile);
 	fclose(hfile);
     }
+    fclose(yyin);
     return 0;
 }