diff --git a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java
index a745f62fcf..4cfd6c6607 100644
--- a/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java
+++ b/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/ConnectorUtils.java
@@ -192,7 +192,7 @@ public static ModelTensors processOutput(
         if (modelResponse == null) {
             throw new IllegalArgumentException("model response is null");
         }
-        if (mlGuard != null && mlGuard.validate(modelResponse, MLGuard.Type.OUTPUT)) {
+        if (mlGuard != null && !mlGuard.validate(modelResponse, MLGuard.Type.OUTPUT)) {
             throw new IllegalArgumentException("guardrails triggered for LLM output");
         }
         List<ModelTensor> modelTensors = new ArrayList<>();