diff --git a/crypto/x86_64cpuid.pl b/crypto/x86_64cpuid.pl
index a9f93bb2cf442d81a52dd630ce8d128db066c0f9..da6d4a232bbcd9a7608db54a50feb251854f9e5f 100644
--- a/crypto/x86_64cpuid.pl
+++ b/crypto/x86_64cpuid.pl
@@ -150,7 +150,7 @@ OPENSSL_ia32_cpuid:
 .LnotP4:
 	cmp	\$6,%ah
 	jne	.Lnotintel
-	and	\$0x0ffff0f0,%eax
+	and	\$0x0fff0ff0,%eax
 	cmp	\$0x00050670,%eax	# Knights Landing
 	je	.Lknights
 	cmp	\$0x00080650,%eax	# Knights Mill (according to sde)