--- a/tools/profiler/core/ProfileBufferEntry.h
+++ b/tools/profiler/core/ProfileBufferEntry.h
@@ -198,19 +198,16 @@ public:
      : mJITAddress(mozilla::Some(aJITAddress))
      , mJITDepth(mozilla::Some(aJITDepth))
     {
       mHash = Hash();
     }
 
     uint32_t Hash() const;
     bool operator==(const FrameKey& aOther) const;
-    bool operator<(const FrameKey& aOther) const {
-      return mHash < aOther.mHash;
-    }
 
   private:
     uint32_t mHash;
   };
 
   struct StackKey {
     mozilla::Maybe<uint32_t> mPrefixStackIndex;
     uint32_t mFrameIndex;
@@ -228,20 +225,16 @@ public:
 
     uint32_t Hash() const { return mHash; }
 
     bool operator==(const StackKey& aOther) const
     {
       return mPrefixStackIndex == aOther.mPrefixStackIndex &&
              mFrameIndex == aOther.mFrameIndex;
     }
-    bool operator<(const StackKey& aOther) const
-    {
-      return mHash < aOther.mHash;
-    }
 
   private:
     uint32_t mHash;
   };
 
   explicit UniqueStacks();
 
   // Needs to be called when using a UniqueStacks object again after having