diff --git a/.github/workflows/aunit.yml b/.github/workflows/aunit.yml
index 117bccd..a23ac7f 100644
--- a/.github/workflows/aunit.yml
+++ b/.github/workflows/aunit.yml
@@ -21,6 +21,7 @@ jobs:
         git clone https://github.com/bxparks/AceRoutine
         git clone https://github.com/bxparks/AUnit
         git clone https://github.com/bxparks/AceCommon
+        git clone https://github.com/hsaturn/EspMock
     - name: Verify tests
       run: |
         make -C tests
diff --git a/src/TinyMqtt.h b/src/TinyMqtt.h
index 9fe9641..1eb23ec 100644
--- a/src/TinyMqtt.h
+++ b/src/TinyMqtt.h
@@ -158,8 +158,8 @@ class MqttClient
 		void dump()
 		{
 			uint32_t ms=millis();
-			Serial << "MqttClient (" << clientId.c_str() << ") p=" << (int32_t) parent
-				<< " c=" << (int32_t)client << (connected() ? " ON " : " OFF"); 
+			Serial << "MqttClient (" << clientId.c_str() << ") p=" << (uint64_t) parent
+				<< " c=" << (uint64_t)client << (connected() ? " ON " : " OFF");
 			Serial << ", alive=" << (uint32_t)alive << '/' << ms << ", ka=" << keep_alive;
 			Serial << (client && client->connected() ? "" : "dis") << "connected";
 		  message.hexdump("entrant msg");
diff --git a/tests/local-tests/Makefile b/tests/local-tests/Makefile
index df1abdb..d6ab7a3 100644
--- a/tests/local-tests/Makefile
+++ b/tests/local-tests/Makefile
@@ -2,5 +2,5 @@
 # Makefile to compile and run Arduino programs natively on Linux or MacOS.
 
 APP_NAME := local-tests
-ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt ESP8266WiFi
+ARDUINO_LIBS := AUnit AceCommon AceTime TinyMqtt EspMock
 include ../../../EpoxyDuino/EpoxyDuino.mk