diff --git a/unittest/commands/test_simple_commands.cpp b/unittest/commands/test_simple_commands.cpp
index c58efcd9ea..2563c09848 100644
--- a/unittest/commands/test_simple_commands.cpp
+++ b/unittest/commands/test_simple_commands.cpp
@@ -81,7 +81,7 @@ TEST_F(SimpleCommandsTest, Echo)
     ASSERT_EQ(lmp->input->echo_log, 1);
 
     TEST_FAILURE(".*ERROR: Illegal echo command.*", command("echo"););
-    TEST_FAILURE(".*ERROR: Illegal echo command.*", command("echo xxx"););
+    TEST_FAILURE(".*ERROR: Unknown echo keyword: xxx.*", command("echo xxx"););
 }
 
 TEST_F(SimpleCommandsTest, Log)