diff --git a/src/workerd/io/worker.c++ b/src/workerd/io/worker.c++
index 2ced8ea1512..d0a40c87526 100644
--- a/src/workerd/io/worker.c++
+++ b/src/workerd/io/worker.c++
@@ -720,8 +720,8 @@ static void stopProfiling(jsg::Lock& js,
       }
 
       auto hitLineCount = allNodes[i]->GetHitLineCount();
-      v8::CpuProfileNode::LineTick lineBuffer[hitLineCount];
-      allNodes[i]->GetLineTicks(lineBuffer, hitLineCount);
+      auto lineBuffer = kj::heapArray<v8::CpuProfileNode::LineTick>(hitLineCount);
+      allNodes[i]->GetLineTicks(lineBuffer.begin(), lineBuffer.size());
 
       auto positionTicks = nodeBuilder.initPositionTicks(hitLineCount);
       for (uint j=0; j < hitLineCount; j++) {