diff --git a/Source/cmUVStreambuf.h b/Source/cmUVStreambuf.h
index 873352b1ad..0737629a28 100644
--- a/Source/cmUVStreambuf.h
+++ b/Source/cmUVStreambuf.h
@@ -61,7 +61,7 @@ public:
   cmBasicUVStreambuf* close();
 
 protected:
-  typename cmBasicUVStreambuf::int_type underflow() override;
+  typename cmBasicUVStreambuf<CharT, Traits>::int_type underflow() override;
   std::streamsize showmanyc() override;
 
   // FIXME: Add write support
diff --git a/Utilities/Release/WiX/CustomAction/detect_nsis_overwrite.cpp b/Utilities/Release/WiX/CustomAction/detect_nsis_overwrite.cpp
index 4b178759d6..593822abaa 100644
--- a/Utilities/Release/WiX/CustomAction/detect_nsis_overwrite.cpp
+++ b/Utilities/Release/WiX/CustomAction/detect_nsis_overwrite.cpp
@@ -10,7 +10,8 @@ std::wstring get_property(MSIHANDLE msi_handle, std::wstring const& name)
 {
   DWORD size = 0;
 
-  UINT status = MsiGetPropertyW(msi_handle, name.c_str(), L"", &size);
+  WCHAR value_buffer[] = L"";
+  UINT status = MsiGetPropertyW(msi_handle, name.c_str(), value_buffer, &size);
 
   if (status == ERROR_MORE_DATA) {
     std::vector<wchar_t> buffer(size + 1);