diff --git a/sm3/sm3block_amd64.go b/sm3/sm3block_amd64.go
index 3c2a762..c45430d 100644
--- a/sm3/sm3block_amd64.go
+++ b/sm3/sm3block_amd64.go
@@ -8,4 +8,4 @@ import "golang.org/x/sys/cpu"
 var useAVX2 = cpu.X86.HasAVX2 && cpu.X86.HasBMI2
 
 //go:noescape
-func block(dig *digest, p []byte)
\ No newline at end of file
+func block(dig *digest, p []byte)