diff --git a/substrate/primitives/runtime/src/lib.rs b/substrate/primitives/runtime/src/lib.rs
index 26db5ef081..deea4a73c8 100644
--- a/substrate/primitives/runtime/src/lib.rs
+++ b/substrate/primitives/runtime/src/lib.rs
@@ -800,7 +800,7 @@ macro_rules! assert_eq_error_rate {
 
 /// Simple blob to hold an extrinsic without committing to its format and ensure it is serialized
 /// correctly.
-#[derive(PartialEq, Eq, Clone, Default, Encode, Decode)]
+#[derive(PartialEq, Eq, Clone, Default, Encode, Decode, TypeInfo)]
 pub struct OpaqueExtrinsic(Vec<u8>);
 
 impl OpaqueExtrinsic {