diff --git a/lib/Hoymiles/src/Hoymiles.cpp b/lib/Hoymiles/src/Hoymiles.cpp
index fc40b8be..806a4733 100644
--- a/lib/Hoymiles/src/Hoymiles.cpp
+++ b/lib/Hoymiles/src/Hoymiles.cpp
@@ -119,7 +119,7 @@ void HoymilesClass::loop()
                     iv->sendGridOnProFileParaRequest();
                 }
 
-                 _messageOutput->printf("Queue size - NRF: %ld CMT: %ld\r\n", _radioNrf->getQueueSize(), _radioCmt->getQueueSize());
+                 _messageOutput->printf("Queue size - NRF: %" PRId32 " CMT: %" PRId32 "\r\n", _radioNrf->getQueueSize(), _radioCmt->getQueueSize());
                 _lastPoll = millis();
             }
 
diff --git a/lib/Hoymiles/src/HoymilesRadio.cpp b/lib/Hoymiles/src/HoymilesRadio.cpp
index 172cfde6..896137e5 100644
--- a/lib/Hoymiles/src/HoymilesRadio.cpp
+++ b/lib/Hoymiles/src/HoymilesRadio.cpp
@@ -176,7 +176,7 @@ bool HoymilesRadio::isQueueEmpty() const
     return _commandQueue.size() == 0;
 }
 
-unsigned long HoymilesRadio::getQueueSize() const
+uint32_t HoymilesRadio::getQueueSize() const
 {
     return _commandQueue.size();
 }
diff --git a/lib/Hoymiles/src/HoymilesRadio.h b/lib/Hoymiles/src/HoymilesRadio.h
index 0e9b3364..95dfe8b0 100644
--- a/lib/Hoymiles/src/HoymilesRadio.h
+++ b/lib/Hoymiles/src/HoymilesRadio.h
@@ -20,7 +20,7 @@ public:
 
     bool isIdle() const;
     bool isQueueEmpty() const;
-    unsigned long getQueueSize() const;
+    uint32_t getQueueSize() const;
     bool isInitialized() const;
 
     void removeCommands(InverterAbstract* inv);