diff --git a/DirectXTex/DirectXTexD3D11.cpp b/DirectXTex/DirectXTexD3D11.cpp
index ebfe674..7d6b302 100644
--- a/DirectXTex/DirectXTexD3D11.cpp
+++ b/DirectXTex/DirectXTexD3D11.cpp
@@ -222,7 +222,7 @@ bool DirectX::IsSupportedTexture(
     const size_t iWidth = metadata.width;
     const size_t iHeight = metadata.height;
 
-    switch (fmt)
+    switch (static_cast<int>(fmt))
     {
     case DXGI_FORMAT_BC4_TYPELESS:
     case DXGI_FORMAT_BC4_UNORM:
diff --git a/DirectXTex/DirectXTexD3D12.cpp b/DirectXTex/DirectXTexD3D12.cpp
index f66b3f7..9681f0e 100644
--- a/DirectXTex/DirectXTexD3D12.cpp
+++ b/DirectXTex/DirectXTexD3D12.cpp
@@ -338,7 +338,7 @@ bool DirectX::IsSupportedTexture(
     const size_t iWidth = metadata.width;
     const size_t iHeight = metadata.height;
 
-    switch (fmt)
+    switch (static_cast<int>(fmt))
     {
     case DXGI_FORMAT_NV12:
     case DXGI_FORMAT_P010: