diff --git a/backend/internal/service/gemini_messages_compat_service_test.go b/backend/internal/service/gemini_messages_compat_service_test.go
index e1b0ba3e..d0560344 100644
--- a/backend/internal/service/gemini_messages_compat_service_test.go
+++ b/backend/internal/service/gemini_messages_compat_service_test.go
@@ -101,11 +101,17 @@ func TestGeminiForwardAsChatCompletions_OAuthRoutesToGeminiAndReturnsChatFormat(
 	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &got))
 	require.Equal(t, "chat.completion", got["object"])
 	require.Equal(t, "gemini-2.5-flash", got["model"])
-	choices := got["choices"].([]any)
-	message := choices[0].(map[string]any)["message"].(map[string]any)
+	choices, ok := got["choices"].([]any)
+	require.True(t, ok)
+	require.NotEmpty(t, choices)
+	choice, ok := choices[0].(map[string]any)
+	require.True(t, ok)
+	message, ok := choice["message"].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, "assistant", message["role"])
 	require.Equal(t, "hello from gemini", message["content"])
-	usage := got["usage"].(map[string]any)
+	usage, ok := got["usage"].(map[string]any)
+	require.True(t, ok)
 	require.Equal(t, float64(7), usage["prompt_tokens"])
 	require.Equal(t, float64(3), usage["completion_tokens"])
 	require.Equal(t, float64(10), usage["total_tokens"])