diff --git a/awx_collection/plugins/modules/tower_inventory_source.py b/awx_collection/plugins/modules/tower_inventory_source.py
index b094bb6b55..afa6c229e2 100644
--- a/awx_collection/plugins/modules/tower_inventory_source.py
+++ b/awx_collection/plugins/modules/tower_inventory_source.py
@@ -77,7 +77,6 @@ options:
       description:
         - Delete child groups and hosts not found in source.
       type: bool
-      default: 'no'
     overwrite_vars:
       description:
         - Override vars in child groups and hosts with those from external source.
@@ -86,7 +85,6 @@ options:
       description:
         - Local absolute file path containing a custom Python virtualenv to use.
       type: str
-      default: ''
     timeout:
       description: The amount of time (in seconds) to run before the task is canceled.
       type: int
@@ -98,7 +96,6 @@ options:
       description:
         - Refresh inventory data from its source each time a job is run.
       type: bool
-      default: 'no'
     update_cache_timeout:
       description:
         - Time in seconds to consider an inventory sync to be current.
@@ -173,7 +170,7 @@ def main():
         group_by=dict(),
         overwrite=dict(type='bool'),
         overwrite_vars=dict(type='bool'),
-        custom_virtualenv=dict(default=''),
+        custom_virtualenv=dict(),
         timeout=dict(type='int'),
         verbosity=dict(type='int', choices=[0, 1, 2]),
         update_on_launch=dict(type='bool'),
@@ -257,7 +254,7 @@ def main():
     # Layer in all remaining optional information
     for field_name in OPTIONAL_VARS:
         field_val = module.params.get(field_name)
-        if field_val:
+        if field_val is not None:
             inventory_source_fields[field_name] = field_val
 
     # Attempt to JSON encode source vars
diff --git a/awx_collection/test/awx/test_inventory_source.py b/awx_collection/test/awx/test_inventory_source.py
index bc4a7bfe1e..ab0296689b 100644
--- a/awx_collection/test/awx/test_inventory_source.py
+++ b/awx_collection/test/awx/test_inventory_source.py
@@ -151,6 +151,31 @@ def test_custom_venv_no_op(run_module, admin_user, base_inventory, mocker, proje
     assert inv_src.description == 'this is the changed description'
 
 
+@pytest.mark.django_db
+def test_falsy_value(run_module, admin_user, base_inventory):
+    result = run_module('tower_inventory_source', dict(
+        name='falsy-test',
+        inventory=base_inventory.name,
+        source='ec2',
+        update_on_launch=True
+    ), admin_user)
+    assert not result.get('failed', False), result.get('msg', result)
+    assert result.get('changed', None), result
+
+    inv_src = InventorySource.objects.get(name='falsy-test')
+    assert inv_src.update_on_launch is True
+
+    result = run_module('tower_inventory_source', dict(
+        name='falsy-test',
+        inventory=base_inventory.name,
+        # source='ec2',
+        update_on_launch=False
+    ), admin_user)
+
+    inv_src.refresh_from_db()
+    assert inv_src.update_on_launch is False
+
+
 # Tests related to source-specific parameters
 #
 # We want to let the API return issues with "this doesn't support that", etc.