diff --git a/src/load.c b/src/load.c
index 7a8f96e..c664906 100644
--- a/src/load.c
+++ b/src/load.c
@@ -914,7 +914,7 @@ static json_t *parse_json(lex_t *lex, size_t flags, json_error_t *error)
 typedef struct
 {
     const char *data;
-    int pos;
+    size_t pos;
 } string_data_t;
 
 static int string_get(void *data)