diff --git a/auto-configurations/models/spring-ai-autoconfigure-model-vertex-ai/src/main/java/org/springframework/ai/model/vertexai/autoconfigure/gemini/VertexAiGeminiChatProperties.java b/auto-configurations/models/spring-ai-autoconfigure-model-vertex-ai/src/main/java/org/springframework/ai/model/vertexai/autoconfigure/gemini/VertexAiGeminiChatProperties.java
index 1770e5ed1c2..60b8c5c8265 100644
--- a/auto-configurations/models/spring-ai-autoconfigure-model-vertex-ai/src/main/java/org/springframework/ai/model/vertexai/autoconfigure/gemini/VertexAiGeminiChatProperties.java
+++ b/auto-configurations/models/spring-ai-autoconfigure-model-vertex-ai/src/main/java/org/springframework/ai/model/vertexai/autoconfigure/gemini/VertexAiGeminiChatProperties.java
@@ -19,11 +19,13 @@
 import org.springframework.ai.vertexai.gemini.VertexAiGeminiChatModel;
 import org.springframework.ai.vertexai.gemini.VertexAiGeminiChatOptions;
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.NestedConfigurationProperty;
 
 /**
  * Configuration properties for Vertex AI Gemini Chat.
  *
  * @author Christian Tzolov
+ * @author Hyunsang Han
  * @since 0.8.0
  */
 @ConfigurationProperties(VertexAiGeminiChatProperties.CONFIG_PREFIX)
@@ -36,6 +38,7 @@ public class VertexAiGeminiChatProperties {
 	/**
 	 * Vertex AI Gemini API generative options.
 	 */
+	@NestedConfigurationProperty
 	private VertexAiGeminiChatOptions options = VertexAiGeminiChatOptions.builder()
 		.temperature(0.7)
 		.candidateCount(1)