diff --git a/mantle/generate-node-key b/mantle/generate-node-key
new file mode 100644
index 00000000..499c03a6
--- /dev/null
+++ b/mantle/generate-node-key
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+cast w n | grep -i 'Private Key' | awk -F ': ' '{print $2}' | sed 's/0x//' > /config/p2p_node_key_txt
diff --git a/op-mantle-fullnode.yml b/op-mantle-fullnode.yml
index aa91eeff..fd0d1745 100644
--- a/op-mantle-fullnode.yml
+++ b/op-mantle-fullnode.yml
@@ -119,7 +119,8 @@ services:
     image: ghcr.io/foundry-rs/foundry
     volumes:
       - "mantle/mainnet/:/config"
-    command: ["sh", "-c", 'cast w n | grep -i "Private Key" | awk -F ": " "{print $2}" | sed "s/0x//" > /config/p2p_node_key_txt']
+      - "./mantle/generate-node-key:/generate-node-key"
+    command: sh /generate-node-key
       
 volumes:  
     mantle-fullnode: