diff --git a/contrib/devtools/security-check.py b/contrib/devtools/security-check.py
index 391984a8f275b..44b7f6c7cc410 100755
--- a/contrib/devtools/security-check.py
+++ b/contrib/devtools/security-check.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2015-2017 The Bitcoin Core developers
+# Copyright (c) 2015-2018 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 '''
@@ -86,7 +86,7 @@ def check_ELF_RELRO(executable):
         # This does not affect security: the permission flags of the GNU_RELRO program header are ignored, the PT_LOAD header determines the effective permissions.
         # However, the dynamic linker need to write to this area so these are RW.
         # Glibc itself takes care of mprotecting this area R after relocations are finished.
-        # See also http://permalink.gmane.org/gmane.comp.gnu.binutils/71347
+        # See also https://marc.info/?l=binutils&m=1498883354122353
         if typ == 'GNU_RELRO':
             have_gnu_relro = True
 
diff --git a/contrib/devtools/split-debug.sh.in b/contrib/devtools/split-debug.sh.in
index deda49cc54104..92b72b1446cf6 100644
--- a/contrib/devtools/split-debug.sh.in
+++ b/contrib/devtools/split-debug.sh.in
@@ -1,5 +1,5 @@
 #!/bin/sh
-
+set -e
 if [ $# -ne 3 ];
     then echo "usage: $0 <input> <stripped-binary> <debug-binary>"
 fi
diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
index c6158c94225ad..7729dd7257dda 100755
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -9,7 +9,7 @@
 
 Example usage:
 
-    find ../gitian-builder/build -type f -executable | xargs python contrib/devtools/symbol-check.py
+    find ../gitian-builder/build -type f -executable | xargs python3 contrib/devtools/symbol-check.py
 '''
 import subprocess
 import re