diff --git a/include/llvm/Support/MathExtras.h b/include/llvm/Support/MathExtras.h
index ea3f7e09542..340dc934934 100644
--- a/include/llvm/Support/MathExtras.h
+++ b/include/llvm/Support/MathExtras.h
@@ -465,26 +465,26 @@ inline double Log2(double Value) {
 /// Log2_32 - This function returns the floor log base 2 of the specified value,
 /// -1 if the value is zero. (32 bit edition.)
 /// Ex. Log2_32(32) == 5, Log2_32(1) == 0, Log2_32(0) == -1, Log2_32(6) == 2
-inline size_t Log2_32(uint32_t Value) {
+inline unsigned Log2_32(uint32_t Value) {
   return 31 - countLeadingZeros(Value);
 }
 
 /// Log2_64 - This function returns the floor log base 2 of the specified value,
 /// -1 if the value is zero. (64 bit edition.)
-inline size_t Log2_64(uint64_t Value) {
+inline unsigned Log2_64(uint64_t Value) {
   return 63 - countLeadingZeros(Value);
 }
 
 /// Log2_32_Ceil - This function returns the ceil log base 2 of the specified
 /// value, 32 if the value is zero. (32 bit edition).
 /// Ex. Log2_32_Ceil(32) == 5, Log2_32_Ceil(1) == 0, Log2_32_Ceil(6) == 3
-inline size_t Log2_32_Ceil(uint32_t Value) {
+inline unsigned Log2_32_Ceil(uint32_t Value) {
   return 32 - countLeadingZeros(Value - 1);
 }
 
 /// Log2_64_Ceil - This function returns the ceil log base 2 of the specified
 /// value, 64 if the value is zero. (64 bit edition.)
-inline size_t Log2_64_Ceil(uint64_t Value) {
+inline unsigned Log2_64_Ceil(uint64_t Value) {
   return 64 - countLeadingZeros(Value - 1);
 }