--- a/xpcom/threads/ThreadStackHelper.h
+++ b/xpcom/threads/ThreadStackHelper.h
@@ -24,17 +24,17 @@
 
 // Support pseudostack on these platforms.
 #if defined(XP_LINUX) || defined(XP_WIN) || defined(XP_MACOSX)
 #  ifdef MOZ_GECKO_PROFILER
 #    define MOZ_THREADSTACKHELPER_PSEUDO
 #  endif
 #endif
 
-#ifdef MOZ_THREADSTACKHELPER_PSEUDO
+#if defined(MOZ_THREADSTACKHELPER_PSEUDO) && defined(XP_WIN)
 #  define MOZ_THREADSTACKHELPER_NATIVE
 #  if defined(__i386__) || defined(_M_IX86)
 #    define MOZ_THREADSTACKHELPER_X86
 #  elif defined(__x86_64__) || defined(_M_X64)
 #    define MOZ_THREADSTACKHELPER_X64
 #  elif defined(__arm__) || defined(_M_ARM)
 #    define MOZ_THREADSTACKHELPER_ARM
 #  else