diff --git a/qutebrowser/app.py b/qutebrowser/app.py
index 64c277c9f..d125d1d1a 100644
--- a/qutebrowser/app.py
+++ b/qutebrowser/app.py
@@ -70,7 +70,7 @@ def run(args):
         sys.exit(usertypes.Exit.ok)
 
     if args.temp_basedir:
-        args.basedir = tempfile.mkdtemp()
+        args.basedir = tempfile.mkdtemp(prefix='qutebrowser-basedir-')
 
     quitter = Quitter(args)
     objreg.register('quitter', quitter)
diff --git a/qutebrowser/misc/editor.py b/qutebrowser/misc/editor.py
index 81323bf5e..32e4100ca 100644
--- a/qutebrowser/misc/editor.py
+++ b/qutebrowser/misc/editor.py
@@ -122,7 +122,8 @@ class ExternalEditor(QObject):
             raise ValueError("Already editing a file!")
         self._text = text
         try:
-            self._oshandle, self._filename = tempfile.mkstemp(text=True)
+            self._oshandle, self._filename = tempfile.mkstemp(
+                text=True, prefix='qutebrowser-editor-')
             if text:
                 encoding = config.get('general', 'editor-encoding')
                 with open(self._filename, 'w', encoding=encoding) as f: