diff --git a/llvm/lib/Transforms/Coroutines/CoroFrame.cpp b/llvm/lib/Transforms/Coroutines/CoroFrame.cpp
--- a/llvm/lib/Transforms/Coroutines/CoroFrame.cpp
+++ b/llvm/lib/Transforms/Coroutines/CoroFrame.cpp
@@ -1535,6 +1535,7 @@
     for (BasicBlock *Pred : Preds) {
       if (CatchSwitchInst *CS =
               dyn_cast<CatchSwitchInst>(Pred->getTerminator())) {
+        (void)CS;
         // CleanupPad with a CatchSwitch predecessor: therefore this is an
         // unwind destination that needs to be handle specially.
         assert(CS->getUnwindDest() == &BB);