diff --git a/contracts/core/04-channel/IBCChannelPacketTimeout.sol b/contracts/core/04-channel/IBCChannelPacketTimeout.sol
index 0df7c5b7..9fbf59a7 100644
--- a/contracts/core/04-channel/IBCChannelPacketTimeout.sol
+++ b/contracts/core/04-channel/IBCChannelPacketTimeout.sol
@@ -266,6 +266,11 @@ contract IBCChannelPacketTimeout is IBCModuleManager, IIBCChannelPacketTimeout,
         } else {
             revert IBCChannelUnknownChannelOrder(channel.ordering);
         }
+
+        delete getCommitments()[IBCCommitment.packetCommitmentKeyCalldata(
+            msg_.packet.sourcePort, msg_.packet.sourceChannel, msg_.packet.sequence
+        )];
+
         lookupModuleByChannel(msg_.packet.sourcePort, msg_.packet.sourceChannel).onTimeoutPacket(
             msg_.packet, _msgSender()
         );
diff --git a/tests/foundry/src/ICS04Packet.t.sol b/tests/foundry/src/ICS04Packet.t.sol
index 28d96bdf..1ac3c1dc 100644
--- a/tests/foundry/src/ICS04Packet.t.sol
+++ b/tests/foundry/src/ICS04Packet.t.sol
@@ -450,6 +450,10 @@ contract TestICS04Packet is
                 ensureChannelCommitment(handler, channelInfo, c);
             }
             assertEq(handler.getPacketCommitment(channelInfo.portId, channelInfo.channelId, p0.sequence), bytes32(0));
+            // same packet timeout must be failed
+            IIBCChannelPacketTimeout.MsgTimeoutPacket memory msg2_ = msgTimeoutPacket(channelInfo.ordering, p0, H(getBlockNumber()));
+            vm.expectRevert();
+            handler.timeoutPacket(msg2_);
         }
     }
 
@@ -506,6 +510,10 @@ contract TestICS04Packet is
                 ensureChannelCommitment(handler, channelInfo, c);
             }
             assertEq(handler.getPacketCommitment(channelInfo.portId, channelInfo.channelId, p0.sequence), bytes32(0));
+            // same packet timeout must be failed
+            IIBCChannelPacketTimeout.MsgTimeoutPacket memory msg2_ = msgTimeoutPacket(channelInfo.ordering, p0, H(getBlockNumber()));
+            vm.expectRevert();
+            handler.timeoutPacket(msg2_);
         }
     }
 
@@ -534,6 +542,10 @@ contract TestICS04Packet is
             }
             counterpartyHandler.channelCloseInit(msgChannelCloseInit(counterpartyChannelInfo));
             handler.timeoutOnClose(msgTimeoutOnClose(counterpartyHandler, orders[i], p0, H(1)));
+            // same packet timeout must be failed
+            IIBCChannelPacketTimeout.MsgTimeoutOnClose memory msg_ = msgTimeoutOnClose(counterpartyHandler, orders[i], p0, H(1));
+            vm.expectRevert();
+            handler.timeoutOnClose(msg_);
         }
     }