diff --git a/modoboa/core/commands/deploy.py b/modoboa/core/commands/deploy.py
index 794bbedfa..1fa808f64 100644
--- a/modoboa/core/commands/deploy.py
+++ b/modoboa/core/commands/deploy.py
@@ -143,6 +143,16 @@ class DeployCommand(Command):
         info['PASSWORD'] = getpass.getpass('Password: ')
         return info
 
+    def _get_extension_list(self):
+        """Ask the API to get the list of all extensions.
+
+        We hardcode the API url here to avoid a loading of
+        django's settings since they are not available yet...
+        """
+        url = "http://api.modoboa.org/"
+        official_exts = ModoAPIClient(url).list_extensions()
+        return [extension["name"] for extension in official_exts]
+
     def install_extensions(self, extensions):
         """Install one or more extensions.
 
@@ -150,13 +160,6 @@ class DeployCommand(Command):
         include in the final configuration.
 
         """
-        if "all" in extensions:
-            # We hardcode the API url here to avoid a loading of
-            # django's settings since they are not available yet...
-            url = "http://api.modoboa.org/"
-            official_exts = ModoAPIClient(url).list_extensions()
-            extensions = [extension["name"] for extension in official_exts]
-
         pip_args = ["install"] + extensions
         pip.main(pip_args)
         extra_settings = []
@@ -206,8 +209,11 @@ class DeployCommand(Command):
                 allowed_host = "localhost"
 
         extra_settings = []
-        if parsed_args.dont_install_extensions and parsed_args.extensions:
-            extra_settings = self.install_extensions(parsed_args.extensions)
+        extensions = parsed_args.extensions
+        if "all" in extensions:
+            extensions = self._get_extension_list()
+        if not parsed_args.dont_install_extensions and extensions:
+            extra_settings = self.install_extensions(extensions)
 
         bower_components_dir = os.path.realpath(
             os.path.join(os.path.dirname(__file__), "../../bower_components")
@@ -224,7 +230,7 @@ class DeployCommand(Command):
                 'timezone': parsed_args.timezone,
                 'bower_components_dir': bower_components_dir,
                 'devmode': parsed_args.devel,
-                'extensions': parsed_args.extensions,
+                'extensions': extensions,
                 'extra_settings': extra_settings
             }
         )