diff --git a/src/ansible_builder/ee_schema.py b/src/ansible_builder/ee_schema.py
index 61db11c6..23f3e152 100644
--- a/src/ansible_builder/ee_schema.py
+++ b/src/ansible_builder/ee_schema.py
@@ -20,14 +20,24 @@
 
 TYPE_DictOrStringOrListOfStrings = {
     "anyOf": [
-        {"type": "object"},
-        {"type": "string"},
         {
-            "type": "array",
-            "items": {
-                "type": "string"
-            }
-        }
+            "type": "object",
+            "additionalProperties": False,
+            "properties": {
+                "roles": {
+                    "type": "array",
+                    "items": {"type": "string"},
+                },
+                "collections": {
+                    "type": "array",
+                    "items": {"type": "string"},
+                },
+            },
+        },
+        {
+            "type": "string",
+            "additionalProperties": False,
+        },
     ]
 }
 
diff --git a/test/unit/test_user_definition.py b/test/unit/test_user_definition.py
index 8323b679..cda4d0a3 100644
--- a/test/unit/test_user_definition.py
+++ b/test/unit/test_user_definition.py
@@ -1,6 +1,10 @@
 import os
 import pytest
 
+from jsonschema import validate
+from jsonschema.exceptions import ValidationError
+
+from ansible_builder.ee_schema import TYPE_DictOrStringOrListOfStrings
 from ansible_builder.exceptions import DefinitionError
 from ansible_builder.main import AnsibleBuilder
 from ansible_builder.user_definition import UserDefinition, ImageDescription
@@ -299,3 +303,41 @@ def test_missing_orig_name_tag(self, key, image):
         with pytest.raises(DefinitionError) as error:
             ImageDescription(ee_section, key)
         assert f"Container image requires a tag: {image}" in str(error.value.args[0])
+
+
+class TestGalaxyDefinition:
+
+    instances = [
+        ("", True),
+        ("requirements.yml", True),
+        ("| requirements.yml", True),
+        ([], False),
+        ({"invalid_key": []}, False),
+        ({"roles": [], "collections2": []}, False),
+        ({"roles2": [], "collections": []}, False),
+        ({"roles": "", "collections": []}, False),
+        ({"roles": [], "collections": ""}, False),
+        ({"roles": [1], "collections": []}, False),
+        ({"roles": [], "collections": [1]}, False),
+        ({}, True),
+        ({"roles": []}, True),
+        ({"collections": []}, True),
+        ({"roles": [], "collections": []}, True),
+        ({"roles": ["openshift"], "collections": []}, True),
+        ({"roles": ["openshift"], "collections": ["community.okd"]}, True),
+        ({"roles": [], "collections": ["community.okd"]}, True),
+        ({"collections": ["community.okd"]}, True),
+        ({"roles": ["openshift"]}, True),
+    ]
+
+    @pytest.mark.parametrize("test_input,expected", instances)
+    def test_galaxy_requirements(self, test_input, expected):
+        """
+        Test Galaxy definition
+        """
+        try:
+            validate(instance=test_input, schema=TYPE_DictOrStringOrListOfStrings)
+            test_passed = True
+        except ValidationError:
+            test_passed = False
+        assert test_passed == expected