diff --git a/mozglue/misc/Mutex_posix.cpp b/mozglue/misc/Mutex_posix.cpp
index f3a501453d51..b16e43b57527 100644
--- a/mozglue/misc/Mutex_posix.cpp
+++ b/mozglue/misc/Mutex_posix.cpp
@@ -163,7 +163,14 @@ void mozilla::detail::MutexImpl::lock() {
         mutexLock();
         break;
       }
-      asm("pause");  // Hint to the processor that we're spinning.
+      // Hint to the processor that we're spinning.
+#ifdef __x86_64__
+#  define SPIN_HINT "pause"
+#elif defined(__aarch64__)
+#  define SPIN_HINT "yield"
+#endif
+      asm volatile(SPIN_HINT ::: "memory");
+#undef SPIN_HINT
       count++;
     } while (!mutexTryLock());