diff --git a/mlir/include/mlir/IR/SymbolInterfaces.td b/mlir/include/mlir/IR/SymbolInterfaces.td
--- a/mlir/include/mlir/IR/SymbolInterfaces.td
+++ b/mlir/include/mlir/IR/SymbolInterfaces.td
@@ -178,10 +178,10 @@
   let extraClassDeclaration = [{
     /// Custom classof that handles the case where the symbol is optional.
     static bool classof(Operation *op) {
-      auto *concept = getInterfaceFor(op);
-      if (!concept)
+      auto *opConcept = getInterfaceFor(op);
+      if (!opConcept)
         return false;
-      return !concept->isOptionalSymbol(concept, op) ||
+      return !opConcept->isOptionalSymbol(opConcept, op) ||
              op->getAttr(::mlir::SymbolTable::getSymbolAttrName());
     }
   }];