diff --git a/mlir/include/mlir/IR/Attributes.h b/mlir/include/mlir/IR/Attributes.h
index cc0cee6a31183..9d5cc36a32718 100644
--- a/mlir/include/mlir/IR/Attributes.h
+++ b/mlir/include/mlir/IR/Attributes.h
@@ -409,7 +409,7 @@ struct CastInfo<To, From,
   /// returns the dynamic ID. This means that T::classof would end up comparing
   /// the static TypeID of the children to the static TypeID of its parent,
   /// making it impossible to downcast from the parent to the child.
-  static inline bool isPossible(mlir::Attribute ty) {
+  static inline bool isPossible([[maybe_unused]] mlir::Attribute ty) {
     /// Return a constant true instead of a dynamic true when casting to self or
     /// up the hierarchy.
     if constexpr (std::is_base_of_v<To, From>) {
diff --git a/mlir/include/mlir/IR/Types.h b/mlir/include/mlir/IR/Types.h
index 46bb733101c12..f865d29de44be 100644
--- a/mlir/include/mlir/IR/Types.h
+++ b/mlir/include/mlir/IR/Types.h
@@ -402,7 +402,7 @@ struct CastInfo<
   /// ID. This means that T::classof would end up comparing the static TypeID of
   /// the children to the static TypeID of its parent, making it impossible to
   /// downcast from the parent to the child.
-  static inline bool isPossible(mlir::Type ty) {
+  static inline bool isPossible([[maybe_unused]] mlir::Type ty) {
     /// Return a constant true instead of a dynamic true when casting to self or
     /// up the hierarchy.
     if constexpr (std::is_base_of_v<To, From>) {
diff --git a/mlir/include/mlir/IR/Value.h b/mlir/include/mlir/IR/Value.h
index a74d0faa1dfc4..d97a58578d482 100644
--- a/mlir/include/mlir/IR/Value.h
+++ b/mlir/include/mlir/IR/Value.h
@@ -603,7 +603,7 @@ struct CastInfo<
   /// that returns the dynamic type. This means that T::classof would end up
   /// comparing the static Kind of the children to the static Kind of its
   /// parent, making it impossible to downcast from the parent to the child.
-  static inline bool isPossible(mlir::Value ty) {
+  static inline bool isPossible([[maybe_unused]] mlir::Value ty) {
     /// Return a constant true instead of a dynamic true when casting to self or
     /// up the hierarchy.
     if constexpr (std::is_base_of_v<To, From>) {