diff --git a/packages/sol-tracing-utils/src/trace_collection_subprovider.ts b/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
index 99f32335c0..7fde1f9b8f 100644
--- a/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
+++ b/packages/sol-tracing-utils/src/trace_collection_subprovider.ts
@@ -199,7 +199,7 @@ export abstract class TraceCollectionSubprovider extends Subprovider {
         const blockchainLifecycle = new BlockchainLifecycle(this._web3Wrapper);
         await blockchainLifecycle.startAsync();
         const fakeTxData = {
-            gas: BLOCK_GAS_LIMIT.toString(16), // tslint:disable-line:custom-no-magic-numbers
+            gas: `0x${BLOCK_GAS_LIMIT.toString(16)}`, // tslint:disable-line:custom-no-magic-numbers
             isFakeTransaction: true, // This transaction (and only it) is allowed to come through when the lock is locked
             ...callData,
             from: callData.from || this._defaultFromAddress,