diff --git a/DesktopEditor/fontengine/MemoryStream.h b/DesktopEditor/fontengine/MemoryStream.h
index 4abebc1290..9f4a61ee5d 100644
--- a/DesktopEditor/fontengine/MemoryStream.h
+++ b/DesktopEditor/fontengine/MemoryStream.h
@@ -59,7 +59,7 @@ static void LOGGING(const std::string& strFile, const std::wstring& strMessage)
 	NSFile::CUtf8Converter::GetUtf8StringFromUnicode(strMessage.c_str(), (LONG)strMessage.length(), pData, lLen);
 	pData[lLen] = 0;
 
-	fprintf(f, (char*)pData);
+	fprintf(f, "%s", (char*)pData);
 	fprintf(f, "\n");
 	fclose(f);