diff --git a/sdk/sdk.go b/sdk/sdk.go
index 8819c45d..e1fadef7 100644
--- a/sdk/sdk.go
+++ b/sdk/sdk.go
@@ -1454,7 +1454,7 @@ type PdebuggerRemotePacket = *DebuggerRemotePacket
 
 // @brief Callback type that can be used to be used
 // as a custom ShowMessages function
-type Callback = unsafe.Pointer
+type Callback = *Char
 
 // @brief The structure of user-input packet in HyperDbg
 type PdebuggeeUserInputPacket = *DebuggeeUserInputPacket
diff --git a/sdk/sdk_test.go b/sdk/sdk_test.go
index 4332d9c6..ce480f68 100644
--- a/sdk/sdk_test.go
+++ b/sdk/sdk_test.go
@@ -18,7 +18,15 @@ func TestSdk(t *testing.T) {
 		assert.True(t, VmxSupportDetection())
 		assert.True(t, SetCustomDriverPathEx(SysPath))
 
-		// SetTextMessageCallback()
+		log := ""
+		SetTextMessageCallback(StringToBytePointer(log))
+		go func() {
+			for {
+				if log != "" {
+					println(log)
+				}
+			}
+		}()
 
 		mylog.Trace("InstallVmmDriver", InstallVmmDriver())