diff --git a/examples/contract-transfer/lib.rs b/examples/contract-transfer/lib.rs
index bdfe00ba931..b756fafb146 100644
--- a/examples/contract-transfer/lib.rs
+++ b/examples/contract-transfer/lib.rs
@@ -27,7 +27,7 @@ pub mod give_me {
     pub struct GiveMe {}
 
     /// The error types.
-    #[derive(Debug, PartialEq, Eq, scale::Encode)]
+    #[derive(Debug, PartialEq, Eq, scale::Encode, scale::Decode)]
     #[cfg_attr(feature = "std", derive(scale_info::TypeInfo))]
     pub enum Error {
         /// Returned if the transfer failed.
diff --git a/examples/erc20/lib.rs b/examples/erc20/lib.rs
index 40bf294d48a..9e643f148d0 100644
--- a/examples/erc20/lib.rs
+++ b/examples/erc20/lib.rs
@@ -60,7 +60,7 @@ mod erc20 {
     }
 
     /// The ERC-20 error types.
-    #[derive(Debug, PartialEq, Eq, scale::Encode)]
+    #[derive(Debug, PartialEq, Eq, scale::Encode, scale::Decode)]
     #[cfg_attr(feature = "std", derive(scale_info::TypeInfo))]
     pub enum Error {
         /// Returned if not enough balance to fulfill a request is available.
diff --git a/examples/trait-erc20/lib.rs b/examples/trait-erc20/lib.rs
index 1b3b350ebce..f95a1c5edb6 100644
--- a/examples/trait-erc20/lib.rs
+++ b/examples/trait-erc20/lib.rs
@@ -34,7 +34,7 @@ mod erc20 {
     };
 
     /// The ERC-20 error types.
-    #[derive(Debug, PartialEq, Eq, scale::Encode)]
+    #[derive(Debug, PartialEq, Eq, scale::Encode, scale::Decode)]
     #[cfg_attr(feature = "std", derive(scale_info::TypeInfo))]
     pub enum Error {
         /// Returned if not enough balance to fulfill a request is available.