diff --git a/config/main.py b/config/main.py
index efb4ca41c2..9897e79ea3 100644
--- a/config/main.py
+++ b/config/main.py
@@ -6343,7 +6343,7 @@ def disable(ctx):
 def polling_int(ctx, interval):
     """Set polling-interval for counter-sampling (0 to disable)"""
     if interval not in range(5, 301) and interval != 0:
-        click.echo("Polling interval must be between 5-300 (0 to disable)")
+        ctx.fail("Polling interval must be between 5-300 (0 to disable)")
 
     config_db = ctx.obj['db']
     sflow_tbl = config_db.get_table('SFLOW')
diff --git a/tests/sflow_test.py b/tests/sflow_test.py
index ecb2782534..ad6c53462c 100644
--- a/tests/sflow_test.py
+++ b/tests/sflow_test.py
@@ -182,6 +182,13 @@ def test_config_sflow_polling_interval(self):
         runner = CliRunner()
         obj = {'db':db.cfgdb}
 
+        # set to 500 out of range
+        result = runner.invoke(config.config.commands["sflow"].
+            commands["polling-interval"], ["500"], obj=obj)
+        print(result.exit_code, result.output)
+        assert result.exit_code != 0
+        assert "Polling interval must be between 5-300" in result.output
+
         # set to 20
         result = runner.invoke(config.config.commands["sflow"].
             commands["polling-interval"], ["20"], obj=obj)