diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index 663af1d64943..603446755aaf 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -3419,8 +3419,8 @@ lowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const {
 
   // If user has set the no alignment function attribute, ignore
   // alloca alignments.
-  uint64_t AlignVal = (RealignOpt ?
-                       dyn_cast<ConstantSDNode>(Align)->getZExtValue() : 0);
+  uint64_t AlignVal =
+      (RealignOpt ? cast<ConstantSDNode>(Align)->getZExtValue() : 0);
 
   uint64_t StackAlign = TFI->getStackAlignment();
   uint64_t RequiredAlign = std::max(AlignVal, StackAlign);