diff --git a/src/cubeb_resampler_internal.h b/src/cubeb_resampler_internal.h
index 2ad751b37a7dc..d035f27b3b5fd 100644
--- a/src/cubeb_resampler_internal.h
+++ b/src/cubeb_resampler_internal.h
@@ -12,25 +12,6 @@
 #include <cassert>
 #include <cmath>
 #include <memory>
-#ifdef CUBEB_GECKO_BUILD
-#include "mozilla/UniquePtr.h"
-// In libc++, symbols such as std::unique_ptr may be defined in std::__1.
-// The _LIBCPP_BEGIN_NAMESPACE_STD and _LIBCPP_END_NAMESPACE_STD macros
-// will expand to the correct namespace.
-#ifdef _LIBCPP_BEGIN_NAMESPACE_STD
-#define MOZ_BEGIN_STD_NAMESPACE _LIBCPP_BEGIN_NAMESPACE_STD
-#define MOZ_END_STD_NAMESPACE _LIBCPP_END_NAMESPACE_STD
-#else
-#define MOZ_BEGIN_STD_NAMESPACE namespace std {
-#define MOZ_END_STD_NAMESPACE }
-#endif
-MOZ_BEGIN_STD_NAMESPACE
-using mozilla::DefaultDelete;
-using mozilla::UniquePtr;
-#define default_delete DefaultDelete
-#define unique_ptr UniquePtr
-MOZ_END_STD_NAMESPACE
-#endif
 #include "cubeb-speex-resampler.h"
 #include "cubeb/cubeb.h"
 #include "cubeb_log.h"