diff --git a/rs/tests/consensus/tecdsa/tecdsa_signature_life_cycle_test.rs b/rs/tests/consensus/tecdsa/tecdsa_signature_life_cycle_test.rs
index 96f29ca668c..830a459e0a0 100644
--- a/rs/tests/consensus/tecdsa/tecdsa_signature_life_cycle_test.rs
+++ b/rs/tests/consensus/tecdsa/tecdsa_signature_life_cycle_test.rs
@@ -100,7 +100,7 @@ fn test(env: TestEnv) {
                     ChainKeyError(\"Requested unknown threshold key: {}, existing keys: {}\")",
                     key_id3, initial_key_ids_as_string,
                 ),
-                error_code: None,
+                error_code: Some("IC0406".to_string()),
             })
         );
         assert_eq!(
@@ -121,7 +121,7 @@ fn test(env: TestEnv) {
                     existing enabled keys: {}\")",
                     key_id3, initial_key_ids_as_string,
                 ),
-                error_code: None,
+                error_code: Some("IC0406".to_string()),
             })
         );
 
@@ -228,7 +228,7 @@ fn test(env: TestEnv) {
                                 existing enabled keys: []\")",
                                 method_name, key_id
                             ),
-                            error_code: None
+                            error_code: Some("IC0406".to_string())
                         })
                     );
                     break;
diff --git a/rs/tests/consensus/tecdsa/tecdsa_signature_timeout_test.rs b/rs/tests/consensus/tecdsa/tecdsa_signature_timeout_test.rs
index 81285874790..eb2de9fed5e 100644
--- a/rs/tests/consensus/tecdsa/tecdsa_signature_timeout_test.rs
+++ b/rs/tests/consensus/tecdsa/tecdsa_signature_timeout_test.rs
@@ -67,7 +67,7 @@ fn test(env: TestEnv) {
                 AgentError::CertifiedReject(RejectResponse {
                     reject_code: RejectCode::CanisterReject,
                     reject_message: "Signature request expired".to_string(),
-                    error_code: None
+                    error_code: Some("IC0406".to_string())
                 })
             )
         }