--- a/js/src/devtools/rootAnalysis/analyzeHeapWrites.js
+++ b/js/src/devtools/rootAnalysis/analyzeHeapWrites.js
@@ -414,17 +414,16 @@ function ignoreContents(entry)
         "Gecko_SetNullImageValue",
 
         // The analysis thinks we'll write to mBits in the DoGetStyleFoo<false>
         // call.  Maybe the template parameter confuses it?
         /nsStyleContext::PeekStyle/,
 
         // Needs main thread assertions or other fixes.
         /UndisplayedMap::GetEntryFor/,
-        /nsStyleContext::CalcStyleDifferenceInternal/,
         /EffectCompositor::GetServoAnimationRule/,
         /LookAndFeel::GetColor/,
         "Gecko_CopyStyleContentsFrom",
         "Gecko_CSSValue_SetAbsoluteLength",
         "Gecko_UnsetDirtyStyleAttr",
         /nsCSSPropertyIDSet::AddProperty/,
     ];
     if (entry.matches(whitelist))