diff --git a/api/starknet_api_openrpc.json b/api/starknet_api_openrpc.json
index 7310b61..6bc8657 100644
--- a/api/starknet_api_openrpc.json
+++ b/api/starknet_api_openrpc.json
@@ -1317,7 +1317,7 @@
                 "title": "Storage key",
                 "$comment": "A storage key, represented as a string of hex digits",
                 "description": "A storage key. Represented as up to 62 hex digits, 3 bits, and 5 leading zeroes.",
-                "pattern": "^0x0[0-7]{1}[a-fA-F0-9]{0,62}$"
+                "pattern": "^0x(0|[0-7]{1}[a-fA-F0-9]{0,62}$)"
             },
             "ETH_ADDRESS": {
                 "title": "Ethereum address",