diff --git a/avalanche/mainnet/firewood/C/config.json b/avalanche/mainnet/firewood/C/config.json
index 7b26c042..571d9830 100644
--- a/avalanche/mainnet/firewood/C/config.json
+++ b/avalanche/mainnet/firewood/C/config.json
@@ -4,7 +4,7 @@
     "eth-rpc-gas-limit": 2500000000,
     "local-txs-enabled": false,
     "pruning-enabled": false,
-    "api-max-duration": 0,
+    "api-max-duration": "0s",
     "api-max-blocks-per-request": 0,
     "allow-unfinalized-queries": false,
     "log-level": "info",
diff --git a/avalanche/mainnet/pruned/C/config.json b/avalanche/mainnet/pruned/C/config.json
index 8a1ea768..d8e47370 100644
--- a/avalanche/mainnet/pruned/C/config.json
+++ b/avalanche/mainnet/pruned/C/config.json
@@ -4,7 +4,7 @@
     "eth-rpc-gas-limit": 2500000000,
     "local-txs-enabled": false,
     "pruning-enabled": true,
-    "api-max-duration": 0,
+    "api-max-duration": "0s",
     "api-max-blocks-per-request": 0,
     "allow-unfinalized-queries": false,
     "log-level": "info",