diff --git a/lesscpy/lessc/lexer.py b/lesscpy/lessc/lexer.py
index c47bd50..a333d94 100644
--- a/lesscpy/lessc/lexer.py
+++ b/lesscpy/lessc/lexer.py
@@ -89,6 +89,7 @@ class LessLexer:
         'css_number',
         'css_color',
         'css_media_type',
+        'css_filter',
         'less_variable',
         't_and',
         't_not',
diff --git a/lesscpy/lessc/parser.py b/lesscpy/lessc/parser.py
index 5abd579..153feff 100644
--- a/lesscpy/lessc/parser.py
+++ b/lesscpy/lessc/parser.py
@@ -634,12 +634,14 @@ class LessParser(object):
 
     def p_filter(self, p):
         """ filter                    : css_filter
+                                      | css_filter t_ws
                                       | t_colon word
                                       | t_colon vendor_property
                                       | t_colon vendor_property t_ws
                                       | t_colon css_property
                                       | t_colon css_property t_ws
                                       | t_colon css_filter
+                                      | t_colon css_filter t_ws
                                       | t_colon t_colon word
                                       | t_colon t_colon vendor_property
         """
diff --git a/test/css/issues/issue30.css b/test/css/issues/issue30.css
new file mode 100644
index 0000000..327c9ee
--- /dev/null
+++ b/test/css/issues/issue30.css
@@ -0,0 +1,4 @@
+tr:nth-child(odd) td,
+tr:nth-child(odd) th {
+	color: red;
+}
diff --git a/test/less/issues/issue30.less b/test/less/issues/issue30.less
new file mode 100644
index 0000000..cc18bb3
--- /dev/null
+++ b/test/less/issues/issue30.less
@@ -0,0 +1,4 @@
+tr:nth-child(odd) td,
+tr:nth-child(odd) th {
+    color: red;
+}