diff --git a/openapi_core/contrib/aiohttp/responses.py b/openapi_core/contrib/aiohttp/responses.py
index 40771e2f..a7baf851 100644
--- a/openapi_core/contrib/aiohttp/responses.py
+++ b/openapi_core/contrib/aiohttp/responses.py
@@ -17,7 +17,10 @@ def data(self) -> str:
         if self.response.body is None:
             return ""
         if isinstance(self.response.body, bytes):
-            return self.response.body.decode("utf-8")
+            try:
+                return self.response.body.decode("utf-8")
+            except UnicodeDecodeError:
+                return self.response.body
         assert isinstance(self.response.body, str)
         return self.response.body
 
diff --git a/tests/integration/contrib/aiohttp/test_aiohttp_project.py b/tests/integration/contrib/aiohttp/test_aiohttp_project.py
index f7abfee3..9b1aee14 100644
--- a/tests/integration/contrib/aiohttp/test_aiohttp_project.py
+++ b/tests/integration/contrib/aiohttp/test_aiohttp_project.py
@@ -38,10 +38,6 @@ def api_key_encoded(self):
 
 
 class TestPetPhotoView(BaseTestPetstore):
-    @pytest.mark.xfail(
-        reason="response binary format not supported",
-        strict=True,
-    )
     async def test_get_valid(self, client, data_gif):
         headers = {
             "Authorization": "Basic testuser",