diff --git a/desmume/src/firmware.cpp b/desmume/src/firmware.cpp
index 14ec129cb..9456bcf4d 100644
--- a/desmume/src/firmware.cpp
+++ b/desmume/src/firmware.cpp
@@ -823,7 +823,9 @@ int NDS_CreateDummyFirmware( struct NDS_fw_config_data *user_settings)
 	//Wifi settings CRC16
 	(*(u16*)(MMU.fw.data + 0x2A)) = calc_CRC16(0, (MMU.fw.data + 0x2C), 0x138);
 
-	memcpy(&CommonSettings.InternalFirmConf, user_settings, sizeof(struct NDS_fw_config_data));
+	if (&CommonSettings.InternalFirmConf != user_settings)
+		memcpy(&CommonSettings.InternalFirmConf, user_settings, sizeof(struct NDS_fw_config_data));
+
 	return TRUE ;
 }