diff --git a/src/runtime/asm_s390x.s b/src/runtime/asm_s390x.s
index 42b9326607..487ed62306 100644
--- a/src/runtime/asm_s390x.s
+++ b/src/runtime/asm_s390x.s
@@ -915,7 +915,8 @@ TEXT runtime·sigreturn(SB),NOSPLIT,$0-0
 	RET
 
 TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
-	SYNC
+        // Stores are already ordered on s390x, so this is just a
+        // compile barrier.
 	RET
 
 TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40