diff --git a/target_snowflake/flattening.py b/target_snowflake/flattening.py
index 40ab48ec..d86964e1 100644
--- a/target_snowflake/flattening.py
+++ b/target_snowflake/flattening.py
@@ -53,6 +53,7 @@ def flatten_schema(d, parent_key=None, sep='__', level=0, max_level=0):
             else:
                 items.append((new_key, v))
         else:
+            # handle situations where, e.g., an `anyOf` value is passed
             if len(v.values()) > 0:
                 if list(v.values())[0][0]['type'] == 'string':
                     list(v.values())[0][0]['type'] = ['null', 'string']
@@ -63,6 +64,9 @@ def flatten_schema(d, parent_key=None, sep='__', level=0, max_level=0):
                 elif list(v.values())[0][0]['type'] == 'object':
                     list(v.values())[0][0]['type'] = ['null', 'object']
                     items.append((new_key, list(v.values())[0][0]))
+                else:
+                    list(v.values())[0][0]['type'] = ['null', 'string']
+                    items.append((new_key, list(v.values())[0][0]))
 
     key_func = lambda item: item[0]
     sorted_items = sorted(items, key=key_func)
diff --git a/tests/unit/test_flattening.py b/tests/unit/test_flattening.py
index 99f47d4c..5b04204b 100644
--- a/tests/unit/test_flattening.py
+++ b/tests/unit/test_flattening.py
@@ -61,6 +61,24 @@ def test_flatten_schema(self):
             }
         }
 
+        not_nested_schema_with_anyof_property_type = {
+            "type": "object",
+            "properties": {
+                "object_col": {"anyOf": [{"type": "object"}, {"type": ["null", "string"]}]},
+                "array_col": {"anyOf": [{"type": "array"}, {"type": ["null", "string"]}]},
+                "bool_col": {"anyOf": [{"type": ["boolean", "null"]}, {"type": ["null", "string"]}]}
+            }
+        }
+        flattened_schema_with_anyof_property_type = {
+            "object_col": {"type": ["null", "object"]},
+            "array_col": {"type": ["null", "array"]},
+            "bool_col": {"type": ["null", "string"]}
+        }
+
+        # NO FLATTENING - Schema with anyOf properties should be cast to a single data type
+        self.assertEqual(flatten_schema(not_nested_schema_with_anyof_property_type),
+                         flattened_schema_with_anyof_property_type)
+
         # NO FLATTENING - Schema with object type property but without further properties should be a plain dictionary
         # No flattening (default)
         self.assertEqual(flatten_schema(nested_schema_with_properties), nested_schema_with_properties['properties'])