diff --git a/js/src/irregexp/imported/regexp-macro-assembler-tracer.cc b/js/src/irregexp/imported/regexp-macro-assembler-tracer.cc
--- a/imported/regexp-macro-assembler-tracer.cc
+++ b/imported/regexp-macro-assembler-tracer.cc
@@ -11,7 +11,7 @@
 namespace internal {

 RegExpMacroAssemblerTracer::RegExpMacroAssemblerTracer(
-    std::unique_ptr<RegExpMacroAssembler>&& assembler)
+    js::UniquePtr<RegExpMacroAssembler>&& assembler)
     : RegExpMacroAssembler(*assembler), assembler_(std::move(assembler)) {
   PrintF("RegExpMacroAssembler%s();\n",
          ImplementationToString(assembler_->Implementation()));
diff --git a/js/src/irregexp/imported/regexp-macro-assembler-tracer.h b/js/src/irregexp/imported/regexp-macro-assembler-tracer.h
index 4af9a4efa6..63d0c1ec37 100644
--- a/imported/regexp-macro-assembler-tracer.h
+++ b/imported/regexp-macro-assembler-tracer.h
@@ -15,7 +15,7 @@
 class RegExpMacroAssemblerTracer: public RegExpMacroAssembler {
  public:
   explicit RegExpMacroAssemblerTracer(
-      std::unique_ptr<RegExpMacroAssembler>&& assembler);
+      js::UniquePtr<RegExpMacroAssembler>&& assembler);
   ~RegExpMacroAssemblerTracer() override;
   void AbortedCodeGeneration() override;
   void AdvanceCurrentPosition(int by) override;    // Signed cp change.
@@ -120,7 +120,7 @@
   void set_can_fallback(bool val) override;

  private:
-  std::unique_ptr<RegExpMacroAssembler> assembler_;
+  js::UniquePtr<RegExpMacroAssembler> assembler_;
 };

 }  // namespace internal