diff --git a/stack_depot.h b/stack_depot.h
index c4d9b27..f2f4d95 100644
--- a/stack_depot.h
+++ b/stack_depot.h
@@ -121,7 +121,7 @@
     u64 HashWithTagBit = (u64(Hash) << 1) | 1;
     if ((Entry & 0x1ffffffff) != HashWithTagBit)
       return false;
-    u32 Size = Entry >> 33;
+    u32 Size = u32(Entry >> 33);
     if (Size >= RingSize)
       return false;
     *RingPosPtr = (RingPos + 1) & RingMask;