diff --git a/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp b/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
--- a/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
@@ -1464,11 +1464,13 @@
   auto &body = method.body();
 
   const char *checkAttrSizedValueSegmentsCode = R"(
-  auto sizeAttr = getAttrOfType<DenseIntElementsAttr>("{0}");
-  auto numElements = sizeAttr.getType().cast<ShapedType>().getNumElements();
-  if (numElements != {1}) {{
-    return emitOpError("'{0}' attribute for specifying {2} segments "
-                       "must have {1} elements");
+  {
+    auto sizeAttr = getAttrOfType<DenseIntElementsAttr>("{0}");
+    auto numElements = sizeAttr.getType().cast<ShapedType>().getNumElements();
+    if (numElements != {1}) {{
+      return emitOpError("'{0}' attribute for specifying {2} segments "
+                         "must have {1} elements");
+    }
   }
   )";