diff --git a/script/bump-version.py b/script/bump-version.py
index 931196e6108d..2e7ad57795bf 100755
--- a/script/bump-version.py
+++ b/script/bump-version.py
@@ -107,7 +107,8 @@ def increase_version(versions, index):
 
 
 def update_electron_gyp(version, suffix):
-  pattern = re.compile(" *'version%' *: *'[0-9.]+(-beta[0-9.]*)?(-dev)?(-nightly[0-9]*)?'")
+  pattern = re.compile(" *'version%' *: *'[0-9.]+(-beta[0-9.]*)?(-dev)?"
+    + "(-nightly[0-9]*)?'")
   with open('electron.gyp', 'r') as f:
     lines = f.readlines()