diff --git a/src/if_cscope.c b/src/if_cscope.c
index 7653308..24d7d06 100644
--- a/src/if_cscope.c
+++ b/src/if_cscope.c
@@ -1098,7 +1098,7 @@
 	FILE *f;
 	char_u *tmp = vim_tempname('c');
 
-	f = fopen((char *)tmp, "w");
+	f = mch_fopen((char *)tmp, "w");
 	cs_file_results(f, nummatches);
 	fclose(f);
 	/* '-' starts a new error list */