--- a/servo/components/style/properties/gecko.mako.rs
+++ b/servo/components/style/properties/gecko.mako.rs
@@ -3385,17 +3385,25 @@ fn static_assert() {
 
     pub fn reset_transition_property(&mut self, other: &Self) {
         self.copy_transition_property_from(other)
     }
 
     ${impl_transition_count('property', 'Property')}
 
     pub fn animations_equals(&self, other: &Self) -> bool {
-        unsafe { bindings::Gecko_StyleAnimationsEquals(&self.gecko.mAnimations, &other.gecko.mAnimations) }
+        return self.gecko.mAnimationNameCount == other.gecko.mAnimationNameCount
+            && self.gecko.mAnimationDelayCount == other.gecko.mAnimationDelayCount
+            && self.gecko.mAnimationDirectionCount == other.gecko.mAnimationDirectionCount
+            && self.gecko.mAnimationDurationCount == other.gecko.mAnimationDurationCount
+            && self.gecko.mAnimationFillModeCount == other.gecko.mAnimationFillModeCount
+            && self.gecko.mAnimationIterationCountCount == other.gecko.mAnimationIterationCountCount
+            && self.gecko.mAnimationPlayStateCount == other.gecko.mAnimationPlayStateCount
+            && self.gecko.mAnimationTimingFunctionCount == other.gecko.mAnimationTimingFunctionCount
+            && unsafe { bindings::Gecko_StyleAnimationsEquals(&self.gecko.mAnimations, &other.gecko.mAnimations) }
     }
 
     pub fn set_animation_name<I>(&mut self, v: I)
         where I: IntoIterator<Item = longhands::animation_name::computed_value::single_value::T>,
               I::IntoIter: ExactSizeIterator
     {
         let v = v.into_iter();
         debug_assert!(v.len() != 0);