diff --git a/contrib/downloadboob/downloadboob.py b/contrib/downloadboob/downloadboob.py
index fe7a5268..644a0792 100755
--- a/contrib/downloadboob/downloadboob.py
+++ b/contrib/downloadboob/downloadboob.py
@@ -192,7 +192,7 @@ class Downloadboob(object):
             return 4
 
         def check_exec(executable):
-            with open('/dev/null', 'w') as devnull:
+            with open(os.devnull, 'w') as devnull:
                 process = subprocess.Popen(['which', executable], stdout=devnull)
                 if process.wait() != 0:
                     print('Please install "%s"' % executable, file=sys.stderr)
diff --git a/weboob/applications/cineoob/cineoob.py b/weboob/applications/cineoob/cineoob.py
index d1da3cdd..49ca3954 100644
--- a/weboob/applications/cineoob/cineoob.py
+++ b/weboob/applications/cineoob/cineoob.py
@@ -503,7 +503,7 @@ class Cineoob(ReplApplication):
                         print(buf)
                     else:
                         try:
-                            with open(dest, 'w') as f:
+                            with open(dest, 'wb') as f:
                                 f.write(buf)
                         except IOError as e:
                             print('Unable to write .torrent in "%s": %s' % (dest, e), file=self.stderr)
diff --git a/weboob/applications/galleroob/galleroob.py b/weboob/applications/galleroob/galleroob.py
index 752b9ad7..5772e898 100644
--- a/weboob/applications/galleroob/galleroob.py
+++ b/weboob/applications/galleroob/galleroob.py
@@ -133,7 +133,7 @@ class Galleroob(ReplApplication):
             name = '%03d.%s' % (i, ext)
             print('Writing file %s' % name)
 
-            with open(name, 'w') as f:
+            with open(name, 'wb') as f:
                 f.write(img.data)
 
         os.chdir(os.path.pardir)
diff --git a/weboob/applications/radioob/radioob.py b/weboob/applications/radioob/radioob.py
index 87695658..9efd5218 100644
--- a/weboob/applications/radioob/radioob.py
+++ b/weboob/applications/radioob/radioob.py
@@ -199,7 +199,7 @@ class Radioob(ReplApplication):
         audio.url = _obj.url
 
         def check_exec(executable):
-            with open('/dev/null', 'w') as devnull:
+            with open(os.devnull, 'w') as devnull:
                 process = subprocess.Popen(['which', executable], stdout=devnull)
                 if process.wait() != 0:
                     print('Please install "%s"' % executable, file=self.stderr)
diff --git a/weboob/applications/videoob/videoob.py b/weboob/applications/videoob/videoob.py
index 7b3e8c5b..35874223 100644
--- a/weboob/applications/videoob/videoob.py
+++ b/weboob/applications/videoob/videoob.py
@@ -81,7 +81,7 @@ class Videoob(ReplApplication):
             return 4
 
         def check_exec(executable):
-            with open('/dev/null', 'w') as devnull:
+            with open(os.devnull, 'w') as devnull:
                 process = subprocess.Popen(['which', executable], stdout=devnull)
                 if process.wait() != 0:
                     print('Please install "%s"' % executable, file=self.stderr)