diff --git a/mfbt/MemoryChecking.h b/mfbt/MemoryChecking.h
index 52d52aaba8a..ec290b37e8a 100644
--- a/mfbt/MemoryChecking.h
+++ b/mfbt/MemoryChecking.h
@@ -34,14 +34,14 @@
 #if defined(MOZ_ASAN)
 #include <stddef.h>
 
+#include "mozilla/Types.h"
+
 extern "C" {
 /* These definitions are usually provided through the
  * sanitizer/asan_interface.h header installed by ASan.
  */
-void __asan_poison_memory_region(void const volatile *addr, size_t size)
-  __attribute__((visibility("default")));
-void __asan_unpoison_memory_region(void const volatile *addr, size_t size)
-  __attribute__((visibility("default")));
+void MOZ_EXPORT __asan_poison_memory_region(void const volatile *addr, size_t size);
+void MOZ_EXPORT __asan_unpoison_memory_region(void const volatile *addr, size_t size);
 
 #define MOZ_MAKE_MEM_NOACCESS(addr, size) \
   __asan_poison_memory_region((addr), (size))