diff --git a/substrate/primitives/runtime/src/generic/unchecked_extrinsic.rs b/substrate/primitives/runtime/src/generic/unchecked_extrinsic.rs
index 96e7988103..1625d42e93 100644
--- a/substrate/primitives/runtime/src/generic/unchecked_extrinsic.rs
+++ b/substrate/primitives/runtime/src/generic/unchecked_extrinsic.rs
@@ -274,6 +274,19 @@ impl<Address: Encode, Signature: Encode, Call: Encode, Extra: SignedExtension> s
 	}
 }
 
+#[cfg(feature = "std")]
+impl<'a, Address: Decode, Signature: Decode, Call: Decode, Extra: SignedExtension> serde::Deserialize<'a>
+	for UncheckedExtrinsic<Address, Call, Signature, Extra>
+{
+	fn deserialize<D>(de: D) -> Result<Self, D::Error> where
+		D: serde::Deserializer<'a>,
+	{
+		let r = sp_core::bytes::deserialize(de)?;
+		Decode::decode(&mut &r[..])
+			.map_err(|e| serde::de::Error::custom(format!("Decode error: {}", e)))
+	}
+}
+
 impl<Address, Call, Signature, Extra> fmt::Debug
 	for UncheckedExtrinsic<Address, Call, Signature, Extra>
 where