diff --git a/crates/openfang-runtime/src/drivers/gemini.rs b/crates/openfang-runtime/src/drivers/gemini.rs
index cd37cc1b3..defdebc31 100644
--- a/crates/openfang-runtime/src/drivers/gemini.rs
+++ b/crates/openfang-runtime/src/drivers/gemini.rs
@@ -60,6 +60,7 @@ struct GeminiRequest {
 struct GeminiContent {
     #[serde(skip_serializing_if = "Option::is_none")]
     role: Option<String>,
+    #[serde(default)]
     parts: Vec<GeminiPart>,
 }