diff --git a/config/main.py b/config/main.py
index aab334e712..450b9fc5c1 100644
--- a/config/main.py
+++ b/config/main.py
@@ -6631,7 +6631,7 @@ def polling_int(ctx, interval):
     """Set polling-interval for counter-sampling (0 to disable)"""
     if ADHOC_VALIDATION:
         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 = ValidatedConfigDBConnector(ctx.obj['db'])
     sflow_tbl = config_db.get_table('SFLOW')
diff --git a/tests/sflow_test.py b/tests/sflow_test.py
index da03ff396e..ecd622655e 100644
--- a/tests/sflow_test.py
+++ b/tests/sflow_test.py
@@ -237,6 +237,7 @@ def test_config_sflow_polling_interval(self):
         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