diff --git a/platform/languages.cpp b/platform/languages.cpp
index 529a29070b..8df6b3f153 100644
--- a/platform/languages.cpp
+++ b/platform/languages.cpp
@@ -38,8 +38,10 @@ namespace languages
 
   static void SetPreferableLanguages(vector<string> const & langCodes)
   {
-    CHECK_EQUAL(langCodes.size(), MAX_SUPPORTED_LANGUAGES, ());
-    for (size_t i = 0; i < langCodes.size(); ++i)
+    size_t const size = langCodes.size();
+    CHECK_EQUAL(size, MAX_SUPPORTED_LANGUAGES, ());
+    CHECK_EQUAL(size, static_cast<int8_t>(size), ());
+    for (int8_t i = 0; i < static_cast<int8_t>(size); ++i)
     {
       int8_t const index = StringUtf8Multilang::GetLangIndex(langCodes[i]);
       if (index >= 0)