diff --git a/src/graph.c b/src/graph.c
index 9ee1a98..be44e35 100644
--- a/src/graph.c
+++ b/src/graph.c
@@ -385,7 +385,8 @@ void print_broken(struct hash *hash, char *remove)
 
 void sort_dirs(char **dirs, int dir_cnt)
 {
-    int i, j, c;
+    int i, j;
+    size_t c;
     char *h;
 
     for (i = 1; i < dir_cnt; i++) {