diff --git a/src/runtime/asm_amd64.s b/src/runtime/asm_amd64.s
index 1abf4075e0..1071d270c1 100644
--- a/src/runtime/asm_amd64.s
+++ b/src/runtime/asm_amd64.s
@@ -1486,6 +1486,7 @@ aes129plus:
 	DECQ	CX
 	SHRQ	$7, CX
 
+	PCALIGN $16
 aesloop:
 	// scramble state
 	AESENC	X8, X8