diff --git a/src/main.cpp b/src/main.cpp
index 55e8a24..35a21eb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -28,12 +28,17 @@ int main(int argc, char** argv)
         branch_subcommand(lg2_obj, app);
         checkout_subcommand(lg2_obj, app);
 
-        app.parse(argc, argv);
+        CLI11_PARSE(app, argc, argv);
 
         if (version->count())
         {
             std::cout << "git2cpp version " << GIT2CPP_VERSION_STRING << " (libgit2 " << LIBGIT2_VERSION << ")" << std::endl;
         }
+
+        if (app.get_subcommands().size() == 0)
+        {
+            std::cout << app.help() << std::endl;
+        }
     }
     catch (const CLI::Error& e)
     {
diff --git a/test/test_git.py b/test/test_git.py
index 899c054..67955ac 100644
--- a/test/test_git.py
+++ b/test/test_git.py
@@ -14,6 +14,6 @@ def test_version(git2cpp_path, arg):
 def test_error_on_unknown_option(git2cpp_path):
     cmd = [git2cpp_path, '--unknown']
     p = subprocess.run(cmd, capture_output=True)
-    assert p.returncode == 1
+    assert p.returncode == 109
     assert p.stdout == b''
     assert p.stderr.startswith(b"The following argument was not expected: --unknown")
diff --git a/test/test_init.py b/test/test_init.py
index 8f0ce9a..fa23ebf 100644
--- a/test/test_init.py
+++ b/test/test_init.py
@@ -43,7 +43,7 @@ def test_init_in_cwd(git2cpp_path, tmp_path, run_in_tmp_path):
 def test_error_on_unknown_option(git2cpp_path):
     cmd = [git2cpp_path, 'init', '--unknown']
     p = subprocess.run(cmd, capture_output=True)
-    assert p.returncode == 1
+    assert p.returncode == 109
     assert p.stdout == b''
     assert p.stderr.startswith(b"The following argument was not expected: --unknown")
 
@@ -51,6 +51,6 @@ def test_error_on_unknown_option(git2cpp_path):
 def test_error_on_repeated_directory(git2cpp_path):
     cmd = [git2cpp_path, 'init', 'abc', 'def']
     p = subprocess.run(cmd, capture_output=True)
-    assert p.returncode == 1
+    assert p.returncode == 109
     assert p.stdout == b''
     assert p.stderr.startswith(b"The following argument was not expected: def")