diff --git a/mlir/lib/Transforms/NormalizeMemRefs.cpp b/mlir/lib/Transforms/NormalizeMemRefs.cpp
--- a/mlir/lib/Transforms/NormalizeMemRefs.cpp
+++ b/mlir/lib/Transforms/NormalizeMemRefs.cpp
@@ -265,7 +265,11 @@
   for (SymbolTable::SymbolUse symbolUse : *symbolUses) {
     Operation *callOp = symbolUse.getUser();
     OpBuilder builder(callOp);
-    StringRef callee = cast<CallOp>(callOp).getCallee();
+    StringRef callee;
+    if (auto castCallOp = dyn_cast<CallOp>(callOp))
+      callee = castCallOp.getCallee();
+    else
+      continue;
     Operation *newCallOp = builder.create<CallOp>(
         callOp->getLoc(), resultTypes, builder.getSymbolRefAttr(callee),
         callOp->getOperands());