--- a/layout/style/nsRuleNode.cpp
+++ b/layout/style/nsRuleNode.cpp
@@ -8682,19 +8682,17 @@ nsRuleNode::ComputePositionData(void* aS
     conditions.SetUncacheable();
   } else {
     SetValue(justifyItemsValue,
              pos->mSpecifiedJustifyItems, conditions,
              SETVAL_ENUMERATED | SETVAL_UNSET_INITIAL,
              parentPos->mSpecifiedJustifyItems, // unused, we handle 'inherit' above
              NS_STYLE_JUSTIFY_AUTO);
     if (pos->mSpecifiedJustifyItems == NS_STYLE_JUSTIFY_AUTO) {
-      // FIXME(emilio): This is kind of unfortunate because this is a reset
-      // property and AUTO is the default value... Can we do better?
-      conditions.SetUncacheable();
+      conditions.SetParentJustifyItemsDependency(parentPos->mJustifyItems);
     }
   }
 
   pos->mJustifyItems = ComputedJustifyItems(pos->mSpecifiedJustifyItems,
                                             parentPos->mJustifyItems);
 
   // justify-self: enum, inherit, initial
   SetValue(*aRuleData->ValueForJustifySelf(),