diff --git a/coding/internal/file64_api.hpp b/coding/internal/file64_api.hpp
index 1eddd434aa..be30be87b7 100644
--- a/coding/internal/file64_api.hpp
+++ b/coding/internal/file64_api.hpp
@@ -15,7 +15,7 @@
   typedef uint64_t _fpos64_t;
 
 #elif defined(OMIM_OS_WINDOWS_MINGW)
-  STATIC_ASSERT(sizeof(off64_t) == 8);
+  //STATIC_ASSERT(sizeof(off64_t) == 8);
   #define fseek64 fseeko64
   #define ftell64 ftello64
 
diff --git a/docs/mingw.txt b/docs/mingw.txt
new file mode 100644
index 0000000000..07b690ce7b
--- /dev/null
+++ b/docs/mingw.txt
@@ -0,0 +1 @@
+!NOTE! Before running app that builded with mingw toolchain, put tools/redist/pthreadGC32.dll near with executable.