diff --git a/src/test/java/org/opensearch/security/authtoken/jwt/JwtVendorTest.java b/src/test/java/org/opensearch/security/authtoken/jwt/JwtVendorTest.java
index 5afe7271e8..7c03ff912d 100644
--- a/src/test/java/org/opensearch/security/authtoken/jwt/JwtVendorTest.java
+++ b/src/test/java/org/opensearch/security/authtoken/jwt/JwtVendorTest.java
@@ -161,7 +161,7 @@ public void testCreateJwtWithBadEncryptionKey() {
                 throw new RuntimeException(e);
             }
         });
-        Assert.assertEquals("java.lang.RuntimeException: encryption_key cannot be null", exception.getMessage());
+        Assert.assertEquals("java.lang.IllegalArgumentException: encryption_key cannot be null", exception.getMessage());
     }
 
     @Test