diff --git a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/GenerationConfig.kt b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/GenerationConfig.kt
index f582b645c8a..18a8beb2f8d 100644
--- a/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/GenerationConfig.kt
+++ b/firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/GenerationConfig.kt
@@ -78,7 +78,7 @@ private constructor(
   val maxOutputTokens: Int?,
   val stopSequences: List<String>?,
   val responseMimeType: String?,
-  val responseSchema: Schema? = null,
+  val responseSchema: Schema?,
 ) {
 
   /**