diff --git a/contrib/devtools/check-doc.py b/contrib/devtools/check-doc.py
--- a/contrib/devtools/check-doc.py
+++ b/contrib/devtools/check-doc.py
@@ -17,6 +17,7 @@
 
 from subprocess import check_output
 import re
+import sys
 
 FOLDER_GREP = 'src'
 FOLDER_TEST = 'src/test/'
@@ -49,7 +50,7 @@
     print "Args unknown     : %s" % len(args_unknown)
     print args_unknown
 
-    exit(len(args_need_doc))
+    sys.exit(len(args_need_doc))
 
 
 if __name__ == "__main__":
diff --git a/contrib/devtools/security-check.py b/contrib/devtools/security-check.py
--- a/contrib/devtools/security-check.py
+++ b/contrib/devtools/security-check.py
@@ -232,4 +232,4 @@
         except IOError:
             print('%s: cannot open' % filename)
             retval = 1
-    exit(retval)
+    sys.exit(retval)
diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -176,4 +176,4 @@
                       (filename, library_name))
                 retval = 1
 
-    exit(retval)
+    sys.exit(retval)
diff --git a/contrib/devtools/update-translations.py b/contrib/devtools/update-translations.py
--- a/contrib/devtools/update-translations.py
+++ b/contrib/devtools/update-translations.py
@@ -37,13 +37,13 @@
     if not os.path.exists('.git'):
         print('No .git directory found')
         print('Execute this script at the root of the repository', file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
 
 def fetch_all_translations():
     if subprocess.call([TX, 'pull', '-f', '-a']):
         print('Error while fetching translations', file=sys.stderr)
-        exit(1)
+        sys.exit(1)
 
 
 def find_format_specifiers(s):
diff --git a/contrib/linearize/linearize-hashes.py b/contrib/linearize/linearize-hashes.py
--- a/contrib/linearize/linearize-hashes.py
+++ b/contrib/linearize/linearize-hashes.py
@@ -93,7 +93,7 @@
             if rpc.response_is_error(resp_obj):
                 print('JSON-RPC: error at height', height + x,
                       ': ', resp_obj['error'], file=sys.stderr)
-                exit(1)
+                sys.exit(1)
             assert(resp_obj['id'] == x)  # assume replies are in-sequence
             if settings['rev_hash_bytes'] == 'true':
                 resp_obj['result'] = hex_switchEndian(resp_obj['result'])
diff --git a/contrib/seeds/generate-seeds.py b/contrib/seeds/generate-seeds.py
--- a/contrib/seeds/generate-seeds.py
+++ b/contrib/seeds/generate-seeds.py
@@ -120,7 +120,7 @@
 def main():
     if len(sys.argv) < 2:
         print(('Usage: %s <path_to_nodes_txt>' % sys.argv[0]), file=sys.stderr)
-        exit(1)
+        sys.exit(1)
     g = sys.stdout
     indir = sys.argv[1]
     g.write('#ifndef BITCOIN_CHAINPARAMSSEEDS_H\n')
diff --git a/share/qt/extract_strings_qt.py b/share/qt/extract_strings_qt.py
--- a/share/qt/extract_strings_qt.py
+++ b/share/qt/extract_strings_qt.py
@@ -61,7 +61,7 @@
     print('Cannot extract strings: xgettext utility is not installed or not configured.', file=sys.stderr)
     print('Please install package "gettext" and re-run \'./configure\'.',
           file=sys.stderr)
-    exit(1)
+    sys.exit(1)
 child = Popen([XGETTEXT, '--output=-', '-n',
                '--keyword=_'] + files, stdout=PIPE)
 (out, err) = child.communicate()