diff --git a/gfx/layers/ipc/CompositorBridgeParent.h b/gfx/layers/ipc/CompositorBridgeParent.h
index 9c5389ac191a..0a0f8775f903 100644
--- a/gfx/layers/ipc/CompositorBridgeParent.h
+++ b/gfx/layers/ipc/CompositorBridgeParent.h
@@ -481,7 +481,7 @@ public:
     return mOptions;
   }
 
-  TimeDuration GetVsyncInterval() const {
+  TimeDuration GetVsyncInterval() const override {
     // the variable is called "rate" but really it's an interval
     return mVsyncRate;
   }
diff --git a/gfx/layers/ipc/CompositorVsyncSchedulerOwner.h b/gfx/layers/ipc/CompositorVsyncSchedulerOwner.h
index c8acb39814ab..543644a87ce7 100644
--- a/gfx/layers/ipc/CompositorVsyncSchedulerOwner.h
+++ b/gfx/layers/ipc/CompositorVsyncSchedulerOwner.h
@@ -21,6 +21,7 @@ public:
   virtual bool IsPendingComposite() = 0;
   virtual void FinishPendingComposite() = 0;
   virtual void CompositeToTarget(gfx::DrawTarget* aTarget, const gfx::IntRect* aRect = nullptr) = 0;
+  virtual TimeDuration GetVsyncInterval() const = 0;
 };
 
 } // namespace layers
diff --git a/gfx/layers/wr/WebRenderBridgeParent.cpp b/gfx/layers/wr/WebRenderBridgeParent.cpp
index 014161c83446..af6f14d161c8 100644
--- a/gfx/layers/wr/WebRenderBridgeParent.cpp
+++ b/gfx/layers/wr/WebRenderBridgeParent.cpp
@@ -1607,6 +1607,17 @@ WebRenderBridgeParent::CompositeToTarget(gfx::DrawTarget* aTarget, const gfx::In
   MaybeGenerateFrame(/* aForceGenerateFrame */ false);
 }
 
+TimeDuration
+WebRenderBridgeParent::GetVsyncInterval() const
+{
+  // This function should only get called in the root WRBP
+  MOZ_ASSERT(IsRootWebRenderBridgeParent());
+  if (CompositorBridgeParent* cbp = GetRootCompositorBridgeParent()) {
+    return cbp->GetVsyncInterval();
+  }
+  return TimeDuration();
+}
+
 void
 WebRenderBridgeParent::MaybeGenerateFrame(bool aForceGenerateFrame)
 {
diff --git a/gfx/layers/wr/WebRenderBridgeParent.h b/gfx/layers/wr/WebRenderBridgeParent.h
index 61af38500de0..96310b1d3e04 100644
--- a/gfx/layers/wr/WebRenderBridgeParent.h
+++ b/gfx/layers/wr/WebRenderBridgeParent.h
@@ -143,6 +143,7 @@ public:
   bool IsPendingComposite() override { return false; }
   void FinishPendingComposite() override { }
   void CompositeToTarget(gfx::DrawTarget* aTarget, const gfx::IntRect* aRect = nullptr) override;
+  TimeDuration GetVsyncInterval() const override;
 
   // CompositableParentManager
   bool IsSameProcess() const override;