diff --git a/util/fontconv.c b/util/fontconv.c
index e3263b4e..4c420cc0 100644
--- a/util/fontconv.c
+++ b/util/fontconv.c
@@ -45,7 +45,7 @@ static int countChar(char *str, char c)
 
 typedef struct str {
 	char *str;
-	size_t len;
+	int len;
 } str;
 
 #define XLFD_TOKENS 14