diff --git a/llvm/include/llvm/ADT/APInt.h b/llvm/include/llvm/ADT/APInt.h
index ccbff7a..d64a051 100644
--- a/llvm/include/llvm/ADT/APInt.h
+++ b/llvm/include/llvm/ADT/APInt.h
@@ -147,7 +147,7 @@
       return *this;
 
     // Mask out the high bits.
-    uint64_t mask = ~uint64_t(0ULL) >> (APINT_BITS_PER_WORD - wordBits);
+    uint64_t mask = UINT64_MAX >> (APINT_BITS_PER_WORD - wordBits);
     if (isSingleWord())
       VAL &= mask;
     else