diff --git a/Telegram/SourceFiles/core/basic_types.h b/Telegram/SourceFiles/core/basic_types.h
index f4fa0809a..d8279bb6c 100644
--- a/Telegram/SourceFiles/core/basic_types.h
+++ b/Telegram/SourceFiles/core/basic_types.h
@@ -54,4 +54,4 @@ void as_const(const T&&) = delete;
 #include <cstdint>
 
 #define qsl(s) QStringLiteral(s)
-#define qstr(s) QLatin1String(s, s + sizeof(s))
+#define qstr(s) QLatin1String(s, static_cast<int>(sizeof(s)-1))