diff --git a/common/src/lib.rs b/common/src/lib.rs
index 658f8b2e01..557fc3199e 100644
--- a/common/src/lib.rs
+++ b/common/src/lib.rs
@@ -160,6 +160,7 @@ pub enum ProxyType {
     SwapHotkey,
     SubnetLeaseBeneficiary, // Used to operate the leased subnet
     RootClaim,
+    CancelProxy, // Only allows rejecting proxy announcements for time-delayed proxies
 }
 
 impl TryFrom<u8> for ProxyType {
@@ -185,6 +186,7 @@ impl TryFrom<u8> for ProxyType {
             15 => Ok(Self::SwapHotkey),
             16 => Ok(Self::SubnetLeaseBeneficiary),
             17 => Ok(Self::RootClaim),
+            18 => Ok(Self::CancelProxy),
             _ => Err(()),
         }
     }
@@ -211,6 +213,7 @@ impl From<ProxyType> for u8 {
             ProxyType::SwapHotkey => 15,
             ProxyType::SubnetLeaseBeneficiary => 16,
             ProxyType::RootClaim => 17,
+            ProxyType::CancelProxy => 18,
         }
     }
 }
diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index 59784e6294..348d5d045f 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -751,6 +751,10 @@ impl InstanceFilter<RuntimeCall> for ProxyType {
                 c,
                 RuntimeCall::SubtensorModule(pallet_subtensor::Call::claim_root { .. })
             ),
+            ProxyType::CancelProxy => matches!(
+                c,
+                RuntimeCall::Proxy(pallet_proxy::Call::reject_announcement { .. })
+            ),
         }
     }
     fn is_superset(&self, o: &Self) -> bool {