diff --git a/insights/core/filters.py b/insights/core/filters.py
index 2deabdcdc..fdcb5ff16 100644
--- a/insights/core/filters.py
+++ b/insights/core/filters.py
@@ -91,20 +91,19 @@ def inner(comp, patterns):
         if comp in _CACHE:
             del _CACHE[comp]
 
-        types = six.string_types + (list, set)
-        if not isinstance(patterns, types):
+        if not isinstance(patterns, (six.string_types, list, set)):
             raise TypeError("Filter patterns must be of type string, list, or set.")
 
         if isinstance(patterns, six.string_types):
-            patterns = {patterns: max_match}
-        elif isinstance(patterns, list):
-            patterns = dict((pt, max_match) for pt in patterns)
-        # here patterns is a dict
+            patterns = [patterns]
 
         for pat in patterns:
             if not pat:
                 raise Exception("Filter patterns must not be empty.")
 
+        patterns = dict((pt, max_match) for pt in patterns)
+        # here patterns is a dict
+
         FILTERS[comp].update(max_matchs(FILTERS[comp], patterns))
 
     if max_match is None or type(max_match) is not int or max_match <= 0:
diff --git a/insights/tests/core/test_filters.py b/insights/tests/core/test_filters.py
index 0e431ede5..f481b3473 100644
--- a/insights/tests/core/test_filters.py
+++ b/insights/tests/core/test_filters.py
@@ -136,7 +136,7 @@ def test_add_filter_to_LocalSpecsHasFilters():
 
 
 # General Parser
-def test_add_filter_to_PsAux():
+def test_add_filter_to_parser_patterns_string():
     """
     "filters" added to Specs.x will add to DefaultSpecs.x
     """
@@ -167,6 +167,23 @@ def test_add_filter_to_parser_patterns_list():
     assert not parser_filters
 
 
+def test_add_filter_to_parser_patterns_set():
+    filters_set = set(["bash", "systemd", "Network"])
+    filters.add_filter(PsAux, filters_set)
+
+    spec_filters = filters.get_filters(Specs.ps_aux)
+    assert all(f in spec_filters for f in filters_set)
+
+    parser_filters = filters.get_filters(PsAux)
+    assert not parser_filters
+
+
+def test_add_filter_to_parser_patterns_tupple():
+    filters_tup = ("bash", "systemd", "Network")
+    with pytest.raises(TypeError):
+        filters.add_filter(PsAux, filters_tup)
+
+
 def test_add_filter_exception_spec_not_filterable():
     with pytest.raises(Exception):
         filters.add_filter(Specs.ps_auxcww, "bash")