diff --git a/extras/tests/MsgPackDeserializer/incompleteInput.cpp b/extras/tests/MsgPackDeserializer/incompleteInput.cpp
index 2b0cca9e..a25cad2b 100644
--- a/extras/tests/MsgPackDeserializer/incompleteInput.cpp
+++ b/extras/tests/MsgPackDeserializer/incompleteInput.cpp
@@ -46,6 +46,7 @@ TEST_CASE("deserializeMsgPack() returns IncompleteInput") {
 
   SECTION("map 32") {
     checkAllSizes("\xDF\x00\x00\x00\x01\xA3one\x01", 10);
+    checkAllSizes("\xDF\x00\x00\x00\x01\xd9\x03one\x01", 11);
   }
 
   SECTION("uint 8") {