diff --git a/include/llvm/ADT/Hashing.h b/include/llvm/ADT/Hashing.h
index 2c270e4ffc5..120f9e56994 100644
--- a/include/llvm/ADT/Hashing.h
+++ b/include/llvm/ADT/Hashing.h
@@ -173,7 +173,7 @@ static const uint64_t k3 = 0xc949d7c7509e6557ULL;
 /// \brief Bitwise right rotate.
 /// Normally this will compile to a single instruction, especially if the
 /// shift is a manifest constant.
-inline uint64_t rotate(uint64_t val, unsigned shift) {
+inline uint64_t rotate(uint64_t val, size_t shift) {
   // Avoid shifting by 64: doing so yields an undefined result.
   return shift == 0 ? val : ((val >> shift) | (val << (64 - shift)));
 }