diff --git a/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java b/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java
index db75de5c7..246530b17 100644
--- a/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java
+++ b/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java
@@ -491,7 +491,7 @@ public class VertexAiGeminiChatOptions implements ToolCallingChatOptions {
 
 		@Deprecated
 		public Builder proxyToolCalls(boolean proxyToolCalls) {
-			return this.internalToolExecutionEnabled(proxyToolCalls);
+			return this.internalToolExecutionEnabled(!proxyToolCalls);
 		}
 
 		public Builder internalToolExecutionEnabled(boolean internalToolExecutionEnabled) {