diff --git a/compat/jansson-2.5/src/dump.c b/compat/jansson-2.5/src/dump.c
index dae12bee..d02f2c6b 100644
--- a/compat/jansson-2.5/src/dump.c
+++ b/compat/jansson-2.5/src/dump.c
@@ -306,7 +306,7 @@ static int do_dump(const json_t *json, size_t flags, int depth,
                 int (*cmp_func)(const void *, const void *);
 
                 size = json_object_size(json);
-                keys = (object_key *)jsonp_malloc(size * sizeof(struct object_key));
+                keys = (struct object_key *)jsonp_malloc(size * sizeof(struct object_key));
                 if(!keys)
                     goto object_error;