diff --git a/.changelog/1215.bugfix.md b/.changelog/1215.bugfix.md
new file mode 100644
index 000000000..2a0732e13
--- /dev/null
+++ b/.changelog/1215.bugfix.md
@@ -0,0 +1 @@
+Stop using mainnet block gas limit on testnet
diff --git a/src/app/components/Blocks/index.tsx b/src/app/components/Blocks/index.tsx
index 178ced0d4..d75f75a43 100644
--- a/src/app/components/Blocks/index.tsx
+++ b/src/app/components/Blocks/index.tsx
@@ -66,7 +66,7 @@ export const Blocks: FC<BlocksProps> = ({
   ]
 
   const tableRows = blocks?.map(block => {
-    const blockGasLimit = paraTimesConfig[block.layer]?.mainnet.blockGasLimit
+    const blockGasLimit = paraTimesConfig[block.layer]?.[block.network]?.blockGasLimit
     if (!blockGasLimit) throw new Error('blockGasLimit is not configured')
     return {
       key: block.hash,
diff --git a/src/app/pages/BlockDetailPage/index.tsx b/src/app/pages/BlockDetailPage/index.tsx
index 104ea878d..143194554 100644
--- a/src/app/pages/BlockDetailPage/index.tsx
+++ b/src/app/pages/BlockDetailPage/index.tsx
@@ -69,7 +69,7 @@ export const BlockDetailView: FC<{
 
   const transactionsAnchor = `${RouteUtils.getBlockRoute(block, block.round)}#${transactionsContainerId}`
   const transactionLabel = block.num_transactions.toLocaleString()
-  const blockGasLimit = paraTimesConfig[block.layer]?.mainnet.blockGasLimit
+  const blockGasLimit = paraTimesConfig[block.layer]?.[block.network]?.blockGasLimit
   if (!blockGasLimit) throw new Error('blockGasLimit is not configured')
   return (
     <StyledDescriptionList