diff --git a/Core/dxerr.cpp b/Core/dxerr.cpp
index b57c70c..1b1babe 100644
--- a/Core/dxerr.cpp
+++ b/Core/dxerr.cpp
@@ -46,11 +46,11 @@
 
 //--------------------------------------------------------------------------------------
 #define  CHK_ERR(hrchk, strOut) \
-        case hrchk: \
+        case static_cast<HRESULT>(hrchk): \
              return L##strOut;
 
 #define  CHK_ERRA(hrchk) \
-        case hrchk: \
+        case static_cast<HRESULT>(hrchk): \
              return L## #hrchk;
 
 #define HRESULT_FROM_WIN32b(x) ((HRESULT)(x) <= 0 ? ((HRESULT)(x)) : ((HRESULT) (((x) & 0x0000FFFF) | (FACILITY_WIN32 << 16) | 0x80000000)))
@@ -3284,11 +3284,11 @@ const WCHAR* WINAPI DXGetErrorStringW( _In_ HRESULT hr )
 #undef CHK_ERR_WIN32_ONLY
 
 #define  CHK_ERRA(hrchk) \
-        case hrchk: \
+        case static_cast<HRESULT>(hrchk): \
              wcscpy_s( desc, count, L## #hrchk ); break;
 
 #define  CHK_ERR(hrchk, strOut) \
-        case hrchk: \
+        case static_cast<HRESULT>(hrchk): \
              wcscpy_s( desc, count, L##strOut ); break;