diff --git a/DeviceCore.cpp b/DeviceCore.cpp
index d354ea1..5595855 100644
--- a/DeviceCore.cpp
+++ b/DeviceCore.cpp
@@ -446,7 +446,7 @@ bool CDeviceCore::UpdateSignedValue( TDeviceParam * Param, const int32_t Value,
 
                 // Mark change & log event
                 Changed = true;
-                Log->Message( DebugLevel, dlLow, "%s: '%s' %s - %u", Name, Param->Name, ((Init)? "initialised" : "changed"), *((int16_t*)Param->Value) );
+                Log->Message( DebugLevel, dlLow, "%s: '%s' %s - %d", Name, Param->Name, ((Init)? "initialised" : "changed"), *((int16_t*)Param->Value) );
             }
             break;
 
@@ -458,7 +458,7 @@ bool CDeviceCore::UpdateSignedValue( TDeviceParam * Param, const int32_t Value,
 
                 // Mark change & log event
                 Changed = true;
-                Log->Message( DebugLevel, dlLow, "%s: '%s' %s - %u", Name, Param->Name, ((Init)? "initialised" : "changed"), *((int32_t*)Param->Value) );
+                Log->Message( DebugLevel, dlLow, "%s: '%s' %s - %d", Name, Param->Name, ((Init)? "initialised" : "changed"), *((int32_t*)Param->Value) );
             }
             break;