diff --git a/kernel/x86_64/zrot_sse.S b/kernel/x86_64/zrot_sse.S
index 4aa0e7211..da79b4abe 100644
--- a/kernel/x86_64/zrot_sse.S
+++ b/kernel/x86_64/zrot_sse.S
@@ -1523,6 +1523,10 @@
 
 .L50:
 	movq	N,  %rax
+	cmpq	$0, INCX
+	je  .L56
+	cmpq	$0, INCY
+	je  .L56
 	sarq	$2, %rax
 	jle	.L55
 	ALIGN_3