diff --git a/src/crypto/x509/x509.go b/src/crypto/x509/x509.go
index 8ce57fb..49ac059 100644
--- a/src/crypto/x509/x509.go
+++ b/src/crypto/x509/x509.go
@@ -14,7 +14,6 @@
 	"crypto/elliptic"
 	"crypto/rsa"
 	"crypto/sha1"
-	_ "crypto/sha1"
 	_ "crypto/sha256"
 	_ "crypto/sha512"
 	"crypto/x509/pkix"