diff --git a/compiler-rt/lib/scudo/standalone/secondary.h b/compiler-rt/lib/scudo/standalone/secondary.h
--- a/compiler-rt/lib/scudo/standalone/secondary.h
+++ b/compiler-rt/lib/scudo/standalone/secondary.h
@@ -522,13 +522,12 @@
       if (FillContents && !Zeroed)
         memset(Ptr, FillContents == ZeroFill ? 0 : PatternFillByte,
                BlockEnd - PtrInt);
-      const uptr BlockSize = BlockEnd - HInt;
       {
         ScopedLock L(Mutex);
         InUseBlocks.push_back(H);
-        AllocatedBytes += BlockSize;
+        AllocatedBytes += H->CommitSize;
         NumberOfAllocs++;
-        Stats.add(StatAllocated, BlockSize);
+        Stats.add(StatAllocated, H->CommitSize);
         Stats.add(StatMapped, H->MemMap.getCapacity());
       }
       return Ptr;