pygost/asn1schemas/cert-dane-hash.py | 3 +--

diff --git a/pygost/asn1schemas/cert-dane-hash.py b/pygost/asn1schemas/cert-dane-hash.py
index 94dd28452be47edd1605037a017bcf9111df4df2f9c12859b0bca88def6ce669..9a493b424fc676bbfc98ebe0f2e0ef60bc323f92ba0061852495b7e09a53dec0 100755
--- a/pygost/asn1schemas/cert-dane-hash.py
+++ b/pygost/asn1schemas/cert-dane-hash.py
@@ -9,8 +9,7 @@
 from pygost.asn1schemas.x509 import Certificate
 
 
-with open(sys.argv[1], "rb") as fd:
-    lines = fd.read().decode("ascii").split("-----")
+lines = sys.stdin.read().split("-----")
 idx = lines.index("BEGIN CERTIFICATE")
 if idx == -1:
     raise ValueError("PEM has no CERTIFICATE")