diff --git a/QUICKSTART-C.md b/QUICKSTART-C.md
index 351d5851..991d61d4 100644
--- a/QUICKSTART-C.md
+++ b/QUICKSTART-C.md
@@ -96,7 +96,7 @@ int main(void) {
         /* deserializes it. */
         msgpack_unpacked msg;
         msgpack_unpacked_init(&msg);
-        bool success = msgpack_unpack_next(&msg, buffer->data, buffer->size, NULL);
+        msgpack_unpack_return ret = msgpack_unpack_next(&msg, buffer->data, buffer->size, NULL);
 
         /* prints the deserialized object. */
         msgpack_object obj = msg.data;
@@ -137,7 +137,7 @@ int main(void) {
            /* deserializes it. */
            msgpack_unpacked msg;
            msgpack_unpacked_init(&msg);
-           bool success = msgpack_unpack_next(&msg, buffer->data, buffer->size, NULL);
+           msgpack_unpack_return ret = msgpack_unpack_next(&msg, buffer->data, buffer->size, NULL);
 
            /* prints the deserialized object. */
            msgpack_object obj = msg.data;