diff --git a/kernel/x86_64/dgemv_t.S b/kernel/x86_64/dgemv_t.S
index 48b3f17c4..3d132c3b5 100644
--- a/kernel/x86_64/dgemv_t.S
+++ b/kernel/x86_64/dgemv_t.S
@@ -171,7 +171,7 @@
 .L0x:
 	xorq	M,M
 	addq	$1,M
-	salq	$22,M
+	salq	$21,M
 	subq	M,MMM
 	jge .L00