diff --git a/mlir/lib/Dialect/Arith/IR/ArithOps.cpp b/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
--- a/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
+++ b/mlir/lib/Dialect/Arith/IR/ArithOps.cpp
@@ -265,7 +265,6 @@
   Type overflowTy = getOverflow().getType();
   // addui_extended(x, 0) -> x, false
   if (matchPattern(getRhs(), m_Zero())) {
-    auto overflowZero = APInt::getZero(1);
     Builder builder(getContext());
     auto falseValue = builder.getZeroAttr(overflowTy);