diff --git a/js/src/irregexp/imported/regexp-bytecode-generator.cc b/js/src/irregexp/imported/regexp-bytecode-generator.cc
index 218352183f97..eab6b8a0b472 100644
--- a/imported/regexp-bytecode-generator.cc
+++ b/imported/regexp-bytecode-generator.cc
@@ -231,7 +231,7 @@ void BytecodeWriter::EmitOperand<ReBcOpType::kBitTable>(const uint8_t* src,
 template <Bytecode bytecode, typename... Args>
 void BytecodeGenerator::Emit(Args... args) {
   // Converts nullptr labels into our internal backtrack_ label.
-  auto fix_label = [this](auto arg) {
+  [[maybe_unused]] auto fix_label = [this](auto arg) {
     if constexpr (std::is_convertible_v<decltype(arg), Label*>) {
       Label* l = static_cast<Label*>(arg);
       return l ? l : &backtrack_;
diff --git a/js/src/irregexp/imported/regexp-interpreter.cc b/js/src/irregexp/imported/regexp-interpreter.cc
index 20191b08ac57..e744301c5b9f 100644
--- a/imported/regexp-interpreter.cc
+++ b/imported/regexp-interpreter.cc
@@ -205,7 +205,7 @@ IrregexpInterpreter::Result ThrowStackOverflow(Isolate* isolate,
   CHECK(call_origin == RegExp::CallOrigin::kFromRuntime);
   // We abort interpreter execution after the stack overflow is thrown, and thus
   // allow allocation here despite the outer DisallowGarbageCollectionScope.
-  AllowGarbageCollection yes_gc;
+  [[maybe_unused]] AllowGarbageCollection yes_gc;
   isolate->StackOverflow();
   return IrregexpInterpreter::EXCEPTION;
 }
@@ -282,7 +282,7 @@ IrregexpInterpreter::Result HandleInterrupts(
           String::IsOneByteRepresentationUnderneath(*subject_string_out);
       Tagged<Object> result;
       {
-        AllowGarbageCollection yes_gc;
+        [[maybe_unused]] AllowGarbageCollection yes_gc;
         result = isolate->stack_guard()->HandleInterrupts();
       }
       if (IsExceptionHole(result, isolate)) {
diff --git a/js/src/irregexp/imported/regexp-macro-assembler.cc b/js/src/irregexp/imported/regexp-macro-assembler.cc
index 2b8b14c8b852..139be763e2a5 100644
--- a/imported/regexp-macro-assembler.cc
+++ b/imported/regexp-macro-assembler.cc
@@ -477,11 +477,11 @@ int NativeRegExpMacroAssembler::CheckStackGuardState(
   {
     DisableGCMole no_gc_mole;
     if (js_has_overflowed) {
-      AllowGarbageCollection yes_gc;
+      [[maybe_unused]] AllowGarbageCollection yes_gc;
       isolate->StackOverflow();
       return_value = EXCEPTION;
     } else if (check.InterruptRequested()) {
-      AllowGarbageCollection yes_gc;
+      [[maybe_unused]] AllowGarbageCollection yes_gc;
       Tagged<Object> result = isolate->stack_guard()->HandleInterrupts();
       if (IsExceptionHole(result, isolate)) return_value = EXCEPTION;
     }