diff --git a/src/unix/atomic-ops.h b/src/unix/atomic-ops.h
index 347d1936..c48d0584 100644
--- a/src/unix/atomic-ops.h
+++ b/src/unix/atomic-ops.h
@@ -52,9 +52,11 @@ UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval)) {
 
 UV_UNUSED(static void cpu_relax(void)) {
 #if defined(__i386__) || defined(__x86_64__)
-  __asm__ __volatile__ ("rep; nop");  /* a.k.a. PAUSE */
+  __asm__ __volatile__ ("rep; nop" ::: "memory");  /* a.k.a. PAUSE */
 #elif (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__)
-  __asm__ volatile("yield");
+  __asm__ __volatile__ ("yield" ::: "memory");
+#elif defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__)
+  __asm__ __volatile__ ("or 1,1,1; or 2,2,2" ::: "memory");
 #endif
 }