diff --git a/runtime/vm/heap/heap.cc b/runtime/vm/heap/heap.cc
index 32053fcaefd..51ef442ec8b 100644
--- a/runtime/vm/heap/heap.cc
+++ b/runtime/vm/heap/heap.cc
@@ -543,11 +543,6 @@ void Heap::CollectOldSpaceGarbage(Thread* thread,
       }
     }
 
-    thread->isolate_group()->ForEachMutatorAtASafepoint([&](Thread* mutator) {
-      // Discard regexp backtracking stacks to further reduce memory usage.
-      mutator->CacheRegexpBacktrackStack(nullptr);
-    });
-
     RecordBeforeGC(type, reason);
     NOT_IN_PRODUCT(VMTagScope tagScope(thread, VMTag::kGCOldSpaceTagId));
     TIMELINE_FUNCTION_GC_DURATION(thread, "CollectOldGeneration");
diff --git a/runtime/vm/thread.h b/runtime/vm/thread.h
index a887d96e640..4ec3fc6554b 100644
--- a/runtime/vm/thread.h
+++ b/runtime/vm/thread.h
@@ -1378,14 +1378,6 @@ class Thread : public ThreadState, public IntrusiveDListEntry<Thread> {
     return OFFSET_OF(Thread, thread_locals_);
   }
 
-  std::unique_ptr<VirtualMemory> TakeRegexpBacktrackStack() {
-    return std::move(regexp_backtracking_stack_cache_);
-  }
-
-  void CacheRegexpBacktrackStack(std::unique_ptr<VirtualMemory> stack) {
-    regexp_backtracking_stack_cache_ = std::move(stack);
-  }
-
  private:
   template <class T>
   T* AllocateReusableHandle();
@@ -1662,8 +1654,6 @@ class Thread : public ThreadState, public IntrusiveDListEntry<Thread> {
 
   MallocGrowableArray<ObjectPtr> pointers_to_verify_at_exit_;
 
-  std::unique_ptr<VirtualMemory> regexp_backtracking_stack_cache_ = nullptr;
-
   explicit Thread(bool is_vm_isolate);
 
   void StoreBufferRelease(