diff --git a/clang/lib/CodeGen/CGBuilder.h b/clang/lib/CodeGen/CGBuilder.h
index 4daf0c760ef8..51c4a16e8d29 100644
--- a/clang/lib/CodeGen/CGBuilder.h
+++ b/clang/lib/CodeGen/CGBuilder.h
@@ -273,13 +273,13 @@ public:
                                bool IsVolatile = false) {
     return CreateMemCpy(Dest.getPointer(), Src.getPointer(), Size,
                         Dest.getAlignment().getQuantity(),
-                        Src.getAlignment().getQuantity(), IsVolatile);
+                        (unsigned)Src.getAlignment().getQuantity(), IsVolatile);
   }
   llvm::CallInst *CreateMemCpy(Address Dest, Address Src, uint64_t Size,
                                bool IsVolatile = false) {
     return CreateMemCpy(Dest.getPointer(), Src.getPointer(), Size,
                         Dest.getAlignment().getQuantity(),
-                        Src.getAlignment().getQuantity(), IsVolatile);
+                        (unsigned)Src.getAlignment().getQuantity(), IsVolatile);
   }
 
   using CGBuilderBaseTy::CreateMemMove;
@@ -287,7 +287,8 @@ public:
                                 bool IsVolatile = false) {
     return CreateMemMove(Dest.getPointer(), Src.getPointer(), Size,
                          Dest.getAlignment().getQuantity(),
-                         Src.getAlignment().getQuantity(), IsVolatile);
+                         (unsigned)Src.getAlignment().getQuantity(),
+                         IsVolatile);
   }
 
   using CGBuilderBaseTy::CreateMemSet;