diff --git a/DirectXTex/DirectXTex.h b/DirectXTex/DirectXTex.h
index a7e0681..f5660f3 100644
--- a/DirectXTex/DirectXTex.h
+++ b/DirectXTex/DirectXTex.h
@@ -40,7 +40,7 @@ namespace DirectX
 
     //---------------------------------------------------------------------------------
     // DXGI Format Utilities
-    bool __cdecl IsValid(_In_ DXGI_FORMAT fmt) noexcept;
+    constexpr bool __cdecl IsValid(_In_ DXGI_FORMAT fmt) noexcept;
     bool __cdecl IsCompressed(_In_ DXGI_FORMAT fmt) noexcept;
     bool __cdecl IsPacked(_In_ DXGI_FORMAT fmt) noexcept;
     bool __cdecl IsVideo(_In_ DXGI_FORMAT fmt) noexcept;
diff --git a/DirectXTex/DirectXTex.inl b/DirectXTex/DirectXTex.inl
index a430b25..aa501b1 100644
--- a/DirectXTex/DirectXTex.inl
+++ b/DirectXTex/DirectXTex.inl
@@ -16,7 +16,7 @@
 //=====================================================================================
 
 _Use_decl_annotations_
-inline bool __cdecl IsValid(DXGI_FORMAT fmt) noexcept
+constexpr inline bool __cdecl IsValid(DXGI_FORMAT fmt) noexcept
 {
     return (static_cast<size_t>(fmt) >= 1 && static_cast<size_t>(fmt) <= 190);
 }