diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index e9dd41a7daa103..91284baf123a3e 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -3223,7 +3223,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
         *this, E, llvm::Intrinsic::vector_reduce_xor, "rdx.xor"));
 
   case Builtin::BI__builtin_matrix_transpose: {
-    const auto *MatrixTy = E->getArg(0)->getType()->getAs<ConstantMatrixType>();
+    auto *MatrixTy = E->getArg(0)->getType()->castAs<ConstantMatrixType>();
     Value *MatValue = EmitScalarExpr(E->getArg(0));
     MatrixBuilder<CGBuilderTy> MB(Builder);
     Value *Result = MB.CreateMatrixTranspose(MatValue, MatrixTy->getNumRows(),