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
@@ -528,7 +528,9 @@
         InUseBlocks.push_back(H);
         AllocatedBytes += BlockSize;
         NumberOfAllocs++;
-        Stats.add(StatAllocated, BlockSize);
+        // Use H->CommitSize since on deallocate it's hard to recalculate
+        // the BlockSize to update the stats properly.
+        Stats.add(StatAllocated, H->CommitSize);
         Stats.add(StatMapped, H->MemMap.getCapacity());
       }
       return Ptr;