diff --git a/modoboa/core/commands/deploy.py b/modoboa/core/commands/deploy.py
index 6c426be39..0dfee4d03 100644
--- a/modoboa/core/commands/deploy.py
+++ b/modoboa/core/commands/deploy.py
@@ -76,6 +76,10 @@ class DeployCommand(Command):
             '--extensions', type=str, nargs='*',
             help="The list of extension to deploy"
         )
+        self._parser.add_argument(
+            '--dont-install-extensions', action='store_true', default=False,
+            help='Do not install extensions using pip'
+        )
 
     def _exec_django_command(self, name, cwd, *args):
         """Run a django command for the freshly created project
@@ -196,7 +200,7 @@ class DeployCommand(Command):
                 allowed_host = "localhost"
 
         extra_settings = []
-        if parsed_args.extensions:
+        if parsed_args.dont_install_extensions and parsed_args.extensions:
             extra_settings = self.install_extensions(parsed_args.extensions)
 
         bower_components_dir = os.path.realpath(
diff --git a/modoboa/lib/test_utils.py b/modoboa/lib/test_utils.py
index 5eec2701c..98888069e 100644
--- a/modoboa/lib/test_utils.py
+++ b/modoboa/lib/test_utils.py
@@ -28,7 +28,8 @@ class TestRunnerMixin(object):
         )
         cmd = (
             "modoboa-admin.py deploy --collectstatic "
-            "--dburl {0} --extensions {1} --domain {2} {3}"
+            "--dburl {0} --extensions {1} --dont-install-extensions "
+            "--domain {2} {3}"
             .format(dburl, self.extension, "localhost", self.projname)
         )
         code, output = exec_cmd(cmd, cwd=self.workdir)