diff --git a/llvm/include/llvm/ADT/BitVector.h b/llvm/include/llvm/ADT/BitVector.h
--- a/llvm/include/llvm/ADT/BitVector.h
+++ b/llvm/include/llvm/ADT/BitVector.h
@@ -824,7 +824,7 @@
     return V;
   }
   static unsigned getHashValue(const BitVector &V) {
-    return DenseMapInfo<std::pair<unsigned, ArrayRef<uintptr_t>>>::getHashValue(
+    return DenseMapInfo<std::pair<size_t, ArrayRef<uintptr_t>>>::getHashValue(
         std::make_pair(V.size(), V.getData()));
   }
   static bool isEqual(const BitVector &LHS, const BitVector &RHS) {
diff --git a/llvm/include/llvm/ADT/SmallBitVector.h b/llvm/include/llvm/ADT/SmallBitVector.h
--- a/llvm/include/llvm/ADT/SmallBitVector.h
+++ b/llvm/include/llvm/ADT/SmallBitVector.h
@@ -721,7 +721,7 @@
   }
   static unsigned getHashValue(const SmallBitVector &V) {
     uintptr_t Store;
-    return DenseMapInfo<std::pair<unsigned, ArrayRef<uintptr_t>>>::getHashValue(
+    return DenseMapInfo<std::pair<size_t, ArrayRef<uintptr_t>>>::getHashValue(
         std::make_pair(V.size(), V.getData(Store)));
   }
   static bool isEqual(const SmallBitVector &LHS, const SmallBitVector &RHS) {