diff --git a/scripts/source.py b/scripts/source.py
index 5266cb4..f037137 100644
--- a/scripts/source.py
+++ b/scripts/source.py
@@ -11,7 +11,7 @@ from .version import src_dir, orca_version
 
 def attach_source_commands(subparsers):
     source_cmd = subparsers.add_parser("source", help="Commands for helping compile the Orca source code into your project.")
-    source_sub = source_cmd.add_subparsers(title="commands")
+    source_sub = source_cmd.add_subparsers(required=True, title="commands")
 
     cflags_cmd = source_sub.add_parser("cflags", help="Get help setting up a C or C++ compiler to compile the Orca source.")
     cflags_cmd.add_argument("srcdir", nargs="?", default=src_dir(), help="the directory containing the Orca source code (defaults to system installation)")