diff --git a/contrib/devtools/chainparams/make_chainparams.py b/contrib/devtools/chainparams/make_chainparams.py
--- a/contrib/devtools/chainparams/make_chainparams.py
+++ b/contrib/devtools/chainparams/make_chainparams.py
@@ -57,7 +57,7 @@
 
 def main(args):
     (chainwork, blockhash) = get_chainparams(args['rpc'], args['block'])
-    output = "{}\n{}\n".format(blockhash, chainwork)
+    output = "{}\n{}".format(blockhash, chainwork)
     return output
 
 
diff --git a/contrib/devtools/chainparams/test_make_chainparams.py b/contrib/devtools/chainparams/test_make_chainparams.py
--- a/contrib/devtools/chainparams/test_make_chainparams.py
+++ b/contrib/devtools/chainparams/test_make_chainparams.py
@@ -115,7 +115,7 @@
             'rpc': mockRPC,
             'block': None,
         }
-        self.assertEqual(GenerateChainParams(args), "{}\n{}\n".format(
+        self.assertEqual(GenerateChainParams(args), "{}\n{}".format(
                          "0000000000000000003ef673ae12bc6017481830d37b9c52ce1e79c080e812b8",
                          "000000000000000000000000000000000000000000f2537ccf2e07bbe15e70e1"))
 
@@ -126,7 +126,7 @@
             'rpc': mockRPC,
             'block': None,
         }
-        self.assertEqual(GenerateChainParams(args), "{}\n{}\n".format(
+        self.assertEqual(GenerateChainParams(args), "{}\n{}".format(
                          "0000000000000000003ef673ae12bc6017481830d37b9c52ce1e79c080e812b8",
                          "000000000000000000000000000000000000000000f2537ccf2e07bbe15e70e1"))
 
@@ -137,7 +137,7 @@
             'rpc': mockRPC,
             'block': self.blockHash1,
         }
-        self.assertEqual(GenerateChainParams(args), "{}\n{}\n".format(
+        self.assertEqual(GenerateChainParams(args), "{}\n{}".format(
                          "0000000000000000003ef673ae12bc6017481830d37b9c52ce1e79c080e812b8",
                          "000000000000000000000000000000000000000000f2537ccf2e07bbe15e70e1"))