diff --git a/dom/animation/AnimationEffectTimingReadOnly.cpp b/dom/animation/AnimationEffectTimingReadOnly.cpp
index 52c7179830af..93df07f89b2e 100644
--- a/dom/animation/AnimationEffectTimingReadOnly.cpp
+++ b/dom/animation/AnimationEffectTimingReadOnly.cpp
@@ -40,7 +40,7 @@ AnimationEffectTimingReadOnly::GetDuration(
 void
 AnimationEffectTimingReadOnly::GetEasing(nsString& aRetVal) const
 {
-  if (mTiming.mFunction.isSome()) {
+  if (mTiming.mFunction) {
     mTiming.mFunction->AppendToString(aRetVal);
   } else {
     aRetVal.AssignLiteral("linear");
diff --git a/dom/animation/ComputedTimingFunction.h b/dom/animation/ComputedTimingFunction.h
index 5c7e578f27a6..4494be5a6df3 100644
--- a/dom/animation/ComputedTimingFunction.h
+++ b/dom/animation/ComputedTimingFunction.h
@@ -44,7 +44,7 @@ public:
   static double GetPortion(const Maybe<ComputedTimingFunction>& aFunction,
                            double aPortion)
   {
-    return aFunction.isSome() ? aFunction->GetValue(aPortion) : aPortion;
+    return aFunction ? aFunction->GetValue(aPortion) : aPortion;
   }
   static int32_t Compare(const Maybe<ComputedTimingFunction>& aLhs,
                          const Maybe<ComputedTimingFunction>& aRhs);