diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
index ef45b9b5b6..68aff531f1 100644
--- a/modules/core/src/system.cpp
+++ b/modules/core/src/system.cpp
@@ -423,27 +423,23 @@ string format( const char* fmt, ... )
 
 string tempfile( const char* suffix )
 {
-#ifdef HAVE_WINRT
-    std::wstring temp_dir = L"";
-    const wchar_t* opencv_temp_dir = _wgetenv(L"OPENCV_TEMP_PATH");
-    if (opencv_temp_dir)
-        temp_dir = std::wstring(opencv_temp_dir);
-#else
+    string fname;
+#ifndef HAVE_WINRT
     const char *temp_dir = getenv("OPENCV_TEMP_PATH");
 #endif
-    string fname;
 
 #if defined WIN32 || defined _WIN32
 #ifdef HAVE_WINRT
     RoInitialize(RO_INIT_MULTITHREADED);
-    std::wstring temp_dir2;
-    if (temp_dir.empty())
-        temp_dir = GetTempPathWinRT();
+    std::wstring temp_dir = L"";
+    const wchar_t* opencv_temp_dir = GetTempPathWinRT().c_str();
+    if (opencv_temp_dir)
+        temp_dir = std::wstring(opencv_temp_dir);
 
     std::wstring temp_file;
     temp_file = GetTempFileNameWinRT(L"ocv");
     if (temp_file.empty())
-        return std::string();
+        return string();
 
     temp_file = temp_dir + std::wstring(L"\\") + temp_file;
     DeleteFileW(temp_file.c_str());
@@ -451,7 +447,7 @@ string tempfile( const char* suffix )
     char aname[MAX_PATH];
     size_t copied = wcstombs(aname, temp_file.c_str(), MAX_PATH);
     CV_Assert((copied != MAX_PATH) && (copied != (size_t)-1));
-    fname = std::string(aname);
+    fname = string(aname);
     RoUninitialize();
 #else
     char temp_dir2[MAX_PATH] = { 0 };
diff --git a/modules/objdetect/src/matching.cpp b/modules/objdetect/src/matching.cpp
index 382f6312a9..484605d051 100644
--- a/modules/objdetect/src/matching.cpp
+++ b/modules/objdetect/src/matching.cpp
@@ -524,7 +524,9 @@ int addNullableBorder(CvLSVMFeatureMap *map, int bx, int by)
     float *new_map;
     sizeX = map->sizeX + 2 * bx;
     sizeY = map->sizeY + 2 * by;
-    new_map = (float *)malloc(sizeof(float) * sizeX * sizeY * map->numFeatures);
+    // fix for Windows Phone 8 ARM compiler
+    size_t size = sizeof(float) * sizeX * sizeY * map->numFeatures;
+    new_map = (float *)malloc(size);
     for (i = 0; i < sizeX * sizeY * map->numFeatures; i++)
     {
         new_map[i] = 0.0;