diff --git a/gfx/thebes/gfxContext.cpp b/gfx/thebes/gfxContext.cpp
index ab9030eb210a..8663382ce323 100644
--- a/gfx/thebes/gfxContext.cpp
+++ b/gfx/thebes/gfxContext.cpp
@@ -244,7 +244,8 @@ TemporaryRef<Path> gfxContext::GetPath()
 
 void gfxContext::SetPath(Path* path)
 {
-  MOZ_ASSERT(path->GetBackendType() == mDT->GetBackendType());
+  MOZ_ASSERT(path->GetBackendType() == mDT->GetBackendType() ||
+             (mDT->GetBackendType() == BackendType::DIRECT2D1_1 && path->GetBackendType() == BackendType::DIRECT2D));
   mPath = path;
   mPathBuilder = nullptr;
   mPathIsRect = false;