diff --git a/freqtrade/strategy/hyper.py b/freqtrade/strategy/hyper.py
index e7f31e20d..0b7055f01 100644
--- a/freqtrade/strategy/hyper.py
+++ b/freqtrade/strategy/hyper.py
@@ -244,6 +244,10 @@ class HyperStrategyMixin(object):
             if not attr_name.startswith('__'):  # Ignore internals, not strictly necessary.
                 attr = getattr(self, attr_name)
                 if issubclass(attr.__class__, BaseParameter):
+                    if (category and attr_name.startswith(category + '_')
+                            and attr.category is not None and attr.category != category):
+                        raise OperationalException(
+                            f'Inconclusive parameter name {attr_name}, category: {attr.category}.')
                     if (category is None or category == attr.category or
                             (attr_name.startswith(category + '_') and attr.category is None)):
                         yield attr_name, attr
diff --git a/tests/optimize/test_hyperopt.py b/tests/optimize/test_hyperopt.py
index 36b6f1229..c13da0d76 100644
--- a/tests/optimize/test_hyperopt.py
+++ b/tests/optimize/test_hyperopt.py
@@ -1093,8 +1093,6 @@ def test_print_epoch_details(capsys):
 
 
 def test_in_strategy_auto_hyperopt(mocker, hyperopt_conf, tmpdir) -> None:
-    # mocker.patch('freqtrade.optimize.hyperopt.dump', MagicMock())
-    # mocker.patch('freqtrade.optimize.hyperopt.file_dump_json')
     (Path(tmpdir) / 'hyperopt_results').mkdir(parents=True)
     # No hyperopt needed
     del hyperopt_conf['hyperopt']
diff --git a/tests/strategy/test_interface.py b/tests/strategy/test_interface.py
index 71f877cc3..3bfa691b4 100644
--- a/tests/strategy/test_interface.py
+++ b/tests/strategy/test_interface.py
@@ -617,3 +617,8 @@ def test_auto_hyperopt_interface(default_conf):
 
     # Parameter is disabled - so value from sell_param dict will NOT be used.
     assert strategy.sell_minusdi.value == 0.5
+
+    strategy.sell_rsi = IntParameter([0, 10], default=5, space='buy')
+
+    with pytest.raises(OperationalException, match=r"Inconclusive parameter.*"):
+        [x for x in strategy.enumerate_parameters('sell')]