diff --git a/src/if_cscope.c b/src/if_cscope.c
index d9982ef..7b6fd92 100644
--- a/src/if_cscope.c
+++ b/src/if_cscope.c
@@ -541,7 +541,7 @@
     char	*ppath = NULL;
     int		i;
     int		len;
-    int		usedlen = 0;
+    size_t	usedlen = 0;
     char_u	*fbuf = NULL;
 
     // get the filename (arg1), expand it, and try to stat it