diff --git a/aredis_om/model/model.py b/aredis_om/model/model.py
index 8018ec8..67769cd 100644
--- a/aredis_om/model/model.py
+++ b/aredis_om/model/model.py
@@ -1320,11 +1320,12 @@ def __new__(cls, name, bases, attrs, **kwargs):  # noqa C901
         meta = meta or getattr(new_class, "Meta", None)
         base_meta = getattr(new_class, "_meta", None)
 
-        if len(bases) == 1:
-            for f_name in bases[0].model_fields:
-                field = bases[0].model_fields[f_name]
-                print(field)
-                new_class.model_fields[f_name] = field
+        if len(bases) >= 1:
+            for base_index in range(len(bases)):
+                model_fields = getattr(bases[base_index], "model_fields", [])
+                for f_name in model_fields:
+                    field = model_fields[f_name]
+                    new_class.model_fields[f_name] = field
 
         if meta and meta != DefaultMeta and meta != base_meta:
             new_class.Meta = meta
diff --git a/tests/test_hash_model.py b/tests/test_hash_model.py
index 875bfdb..12df8cd 100644
--- a/tests/test_hash_model.py
+++ b/tests/test_hash_model.py
@@ -18,6 +18,7 @@
     Migrator,
     NotFoundError,
     QueryNotSupportedError,
+    RedisModel,
     RedisModelError,
 )
 
@@ -976,3 +977,28 @@ class Child(Model):
 
     assert rematerialized.age == 18
     assert rematerialized.bio is None
+
+
+@py_test_mark_asyncio
+async def test_child_class_expression_proxy_with_mixin():
+    # https://github.com/redis/redis-om-python/issues/669 seeing weird issue with child classes initalizing all their undefined members as ExpressionProxies
+    class Model(RedisModel, abc.ABC):
+        first_name: str
+        last_name: str
+        age: int = Field(default=18)
+        bio: Optional[str] = Field(default=None)
+
+    class Child(Model, HashModel):
+        other_name: str
+        # is_new: bool = Field(default=True)
+
+    await Migrator().run()
+    m = Child(first_name="Steve", last_name="Lorello", other_name="foo")
+    await m.save()
+    print(m.age)
+    assert m.age == 18
+
+    rematerialized = await Child.find(Child.pk == m.pk).first()
+
+    assert rematerialized.age == 18
+    assert rematerialized.bio is None
diff --git a/tests/test_json_model.py b/tests/test_json_model.py
index 5677d9e..a3e4d40 100644
--- a/tests/test_json_model.py
+++ b/tests/test_json_model.py
@@ -21,6 +21,7 @@
     Migrator,
     NotFoundError,
     QueryNotSupportedError,
+    RedisModel,
     RedisModelError,
 )
 
@@ -1160,7 +1161,6 @@ class TestLiterals(JsonModel):
     assert rematerialized.pk == item.pk
 
 
-
 @py_test_mark_asyncio
 async def test_two_false_pks():
     from pydantic_core import PydanticUndefined as Undefined
@@ -1171,6 +1171,7 @@ class SomeModel(JsonModel):
 
     SomeModel(field1="foo", field2="bar")
 
+
 @py_test_mark_asyncio
 async def test_child_class_expression_proxy():
     # https://github.com/redis/redis-om-python/issues/669 seeing weird issue with child classes initalizing all their undefined members as ExpressionProxies
@@ -1195,6 +1196,31 @@ class Child(Model):
     assert rematerialized.age != 19
     assert rematerialized.bio is None
 
+
+@py_test_mark_asyncio
+async def test_child_class_expression_proxy_with_mixin():
+    class Model(RedisModel, abc.ABC):
+        first_name: str
+        last_name: str
+        age: int = Field(default=18)
+        bio: Optional[str] = Field(default=None)
+
+    class Child(Model, JsonModel):
+        is_new: bool = Field(default=True)
+
+    await Migrator().run()
+    m = Child(first_name="Steve", last_name="Lorello")
+    await m.save()
+    print(m.age)
+    assert m.age == 18
+
+    rematerialized = await Child.find(Child.pk == m.pk).first()
+
+    assert rematerialized.age == 18
+    assert rematerialized.age != 19
+    assert rematerialized.bio is None
+
+
 @py_test_mark_asyncio
 async def test_merged_model_error():
     class Player(EmbeddedJsonModel):
@@ -1209,4 +1235,3 @@ class Game(JsonModel):
     )
     print(q.query)
     assert q.query == "(@player1_username:{username})| (@player2_username:{username})"
-