diff --git a/gfx/layers/d3d11/TextureD3D11.cpp b/gfx/layers/d3d11/TextureD3D11.cpp
index e3d0c10a60ed..7f8ab65d21fa 100644
--- a/gfx/layers/d3d11/TextureD3D11.cpp
+++ b/gfx/layers/d3d11/TextureD3D11.cpp
@@ -642,7 +642,9 @@ static CompositorD3D11* AssertD3D11Compositor(Compositor* aCompositor)
 {
   CompositorD3D11* compositor = aCompositor ? aCompositor->AsCompositorD3D11()
                                             : nullptr;
-  MOZ_DIAGNOSTIC_ASSERT(!!compositor);
+  if (!compositor) {
+    gfxCriticalNote << "[D3D11] Attempt to set an incompatible compositor";
+  }
   return compositor;
 }