diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index ab4b3bf..399b873 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -121,7 +121,8 @@
     const llvm::Type *ResultType = ConvertType(E->getType());
     Value *Result = Builder.CreateCall(F, ArgValue, "tmp");
     if (Result->getType() != ResultType)
-      Result = Builder.CreateIntCast(Result, ResultType, "cast");
+      Result = Builder.CreateIntCast(Result, ResultType, /*isSigned*/true,
+                                     "cast");
     return RValue::get(Result);
   }
   case Builtin::BI__builtin_clz:
@@ -135,7 +136,8 @@
     const llvm::Type *ResultType = ConvertType(E->getType());
     Value *Result = Builder.CreateCall(F, ArgValue, "tmp");
     if (Result->getType() != ResultType)
-      Result = Builder.CreateIntCast(Result, ResultType, "cast");
+      Result = Builder.CreateIntCast(Result, ResultType, /*isSigned*/true,
+                                     "cast");
     return RValue::get(Result);
   }
   case Builtin::BI__builtin_ffs:
@@ -154,7 +156,8 @@
     Value *IsZero = Builder.CreateICmpEQ(ArgValue, Zero, "iszero");
     Value *Result = Builder.CreateSelect(IsZero, Zero, Tmp, "ffs");
     if (Result->getType() != ResultType)
-      Result = Builder.CreateIntCast(Result, ResultType, "cast");
+      Result = Builder.CreateIntCast(Result, ResultType, /*isSigned*/true,
+                                     "cast");
     return RValue::get(Result);
   }
   case Builtin::BI__builtin_parity:
@@ -171,7 +174,8 @@
     Value *Result = Builder.CreateAnd(Tmp, llvm::ConstantInt::get(ArgType, 1),
                                       "tmp");
     if (Result->getType() != ResultType)
-      Result = Builder.CreateIntCast(Result, ResultType, "cast");
+      Result = Builder.CreateIntCast(Result, ResultType, /*isSigned*/true,
+                                     "cast");
     return RValue::get(Result);
   }
   case Builtin::BI__builtin_popcount:
@@ -185,7 +189,8 @@
     const llvm::Type *ResultType = ConvertType(E->getType());
     Value *Result = Builder.CreateCall(F, ArgValue, "tmp");
     if (Result->getType() != ResultType)
-      Result = Builder.CreateIntCast(Result, ResultType, "cast");
+      Result = Builder.CreateIntCast(Result, ResultType, /*isSigned*/true,
+                                     "cast");
     return RValue::get(Result);
   }
   case Builtin::BI__builtin_expect: