diff --git a/test/bin/json_process.c b/test/bin/json_process.c
index f7f46d0..fc98543 100644
--- a/test/bin/json_process.c
+++ b/test/bin/json_process.c
@@ -63,7 +63,7 @@ static const char *strip(char *str) {
 }
 
 static char *loadfile(FILE *file) {
-    long fsize, ret;
+    size_t fsize, ret;
     char *buf;
 
     fseek(file, 0, SEEK_END);