diff --git a/coding/huffman.hpp b/coding/huffman.hpp
index dfe2882614..a59b24a195 100644
--- a/coding/huffman.hpp
+++ b/coding/huffman.hpp
@@ -21,10 +21,10 @@ public:
   struct Code
   {
     uint32_t bits;
-    uint32_t len;
+    size_t len;
 
     Code() : bits(0), len(0) {}
-    Code(uint32_t bits, uint32_t len) : bits(bits), len(len) {}
+    Code(uint32_t bits, size_t len) : bits(bits), len(len) {}
 
     bool operator<(const Code & o) const
     {
@@ -134,7 +134,7 @@ private:
     Node *l, *r;
     uint32_t symbol;
     uint32_t freq;
-    uint32_t depth;
+    size_t depth;
     bool isLeaf;
 
     Node(uint32_t symbol, uint32_t freq, bool isLeaf)
@@ -156,7 +156,7 @@ private:
   // No need to clump the interface: keep private the methods
   // that encode one symbol only.
   template <typename TWriter>
-  uint32_t EncodeAndWrite(BitWriter<TWriter> & bitWriter, uint32_t symbol) const
+  size_t EncodeAndWrite(BitWriter<TWriter> & bitWriter, uint32_t symbol) const
   {
     Code code;
     CHECK(Encode(symbol, code), ());
diff --git a/coding/zlib.cpp b/coding/zlib.cpp
index e1646d2f91..f54cc574b4 100644
--- a/coding/zlib.cpp
+++ b/coding/zlib.cpp
@@ -25,7 +25,7 @@ ZLib::Processor::Processor(void const * data, size_t size) noexcept : m_init(fal
   // zconf.h. So, for portability, const_cast<...> is used here, but
   // in any case, zlib does not modify |data|.
   m_stream.next_in = static_cast<unsigned char *>(const_cast<void *>(data));
-  m_stream.avail_in = size;
+  m_stream.avail_in = static_cast<unsigned int>(size);
 
   m_stream.next_out = m_buffer;
   m_stream.avail_out = kBufferSize;
diff --git a/platform/http_client_apple.mm b/platform/http_client_apple.mm
index 2157776b3c..7c366dafa0 100644
--- a/platform/http_client_apple.mm
+++ b/platform/http_client_apple.mm
@@ -55,12 +55,12 @@ static const double kTimeoutInSeconds = 24.0;
 bool HttpClient::RunHttpRequest()
 {
   NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:
-      [NSURL URLWithString:[NSString stringWithUTF8String:m_urlRequested.c_str()]]
+      static_cast<NSURL *>([NSURL URLWithString:@(m_urlRequested.c_str())])
       cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:kTimeoutInSeconds];
   // We handle cookies manually.
   request.HTTPShouldHandleCookies = NO;
 
-  request.HTTPMethod = [NSString stringWithUTF8String:m_httpMethod.c_str()];
+  request.HTTPMethod = @(m_httpMethod.c_str());
   for (auto const & header : m_headers)
   {
     [request setValue:@(header.second.c_str()) forHTTPHeaderField:@(header.first.c_str())];
@@ -125,7 +125,7 @@ bool HttpClient::RunHttpRequest()
       if (m_outputFile.empty())
         m_serverResponse.assign(reinterpret_cast<char const *>(url_data.bytes), url_data.length);
       else
-        [url_data writeToFile:[NSString stringWithUTF8String:m_outputFile.c_str()] atomically:YES];
+        [url_data writeToFile:@(m_outputFile.c_str()) atomically:YES];
 
     }
 
diff --git a/platform/http_thread_apple.mm b/platform/http_thread_apple.mm
index 423b35db91..5f617f8a8c 100644
--- a/platform/http_thread_apple.mm
+++ b/platform/http_thread_apple.mm
@@ -46,7 +46,7 @@ static id<DownloadIndicatorProtocol> downloadIndicator = nil;
 	m_expectedSize = size;
 
 	NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:
-			[NSURL URLWithString:[NSString stringWithUTF8String:url.c_str()]]
+			static_cast<NSURL *>([NSURL URLWithString:@(url.c_str())])
 			cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:TIMEOUT_IN_SECONDS];
 
 	// use Range header only if we don't download whole file from start
@@ -77,7 +77,7 @@ static id<DownloadIndicatorProtocol> downloadIndicator = nil;
 	if (url.find("mapswithme.com") != string::npos)
 	{
 		static string const uid = GetPlatform().UniqueClientId();
-		[request addValue:[NSString stringWithUTF8String: uid.c_str()] forHTTPHeaderField:@"User-Agent"];
+		[request addValue:@(uid.c_str()) forHTTPHeaderField:@"User-Agent"];
 	}
 
 #ifdef OMIM_OS_IPHONE