diff --git a/sys/crypto/aesni/aeskeys_amd64.S b/sys/crypto/aesni/aeskeys_amd64.S
index 5a7605af62bd..23a4d3dc1fba 100644
--- a/sys/crypto/aesni/aeskeys_amd64.S
+++ b/sys/crypto/aesni/aeskeys_amd64.S
@@ -162,7 +162,7 @@ ENTRY(aesni_set_enckey)
 	.byte	0x66,0x0f,0x3a,0xdf,0xc8,0x20
 	call	_key_expansion_256b
 //	aeskeygenassist $0x40,%xmm2,%xmm1	# round 7
-	.byte	0x66,0x0f,0x3a,0xdf,0xca,0x20
+	.byte	0x66,0x0f,0x3a,0xdf,0xca,0x40
 	call	_key_expansion_256a
 	retq
 .Lenc_key192:
diff --git a/sys/crypto/aesni/aeskeys_i386.S b/sys/crypto/aesni/aeskeys_i386.S
index f575512cc988..f9be26d2197c 100644
--- a/sys/crypto/aesni/aeskeys_i386.S
+++ b/sys/crypto/aesni/aeskeys_i386.S
@@ -167,7 +167,7 @@ ENTRY(aesni_set_enckey)
 	.byte	0x66,0x0f,0x3a,0xdf,0xc8,0x20
 	call	_key_expansion_256b
 //	aeskeygenassist $0x40,%xmm2,%xmm1	# round 7
-	.byte	0x66,0x0f,0x3a,0xdf,0xca,0x20
+	.byte	0x66,0x0f,0x3a,0xdf,0xca,0x40
 	call	_key_expansion_256a
 	.cfi_adjust_cfa_offset -4
 	leave