diff --git a/CSS3.sublime-syntax b/CSS3.sublime-syntax
index e3f4a1e..0adc322 100644
--- a/CSS3.sublime-syntax
+++ b/CSS3.sublime-syntax
@@ -11065,6 +11065,7 @@ contexts:
           in-range|
           hover|
           host|
+          defined|
           future|
           fullscreen|
           focus-within|
diff --git a/test/syntax_test_selectors.css b/test/syntax_test_selectors.css
index 8f4f74b..ca84b3d 100644
--- a/test/syntax_test_selectors.css
+++ b/test/syntax_test_selectors.css
@@ -239,6 +239,11 @@
  /* <- entity.other.attribute-name.pseudo-class.css */
 /*^^^ entity.other.attribute-name.pseudo-class.css */
 /*   ^ -entity.other.attribute-name.pseudo-class.css */
+:defined {}
+/* <- entity.other.attribute-name.pseudo-class.css punctuation.definition.entity.pseudo-class.css */
+ /* <- entity.other.attribute-name.pseudo-class.css */
+/*^^^^^^ entity.other.attribute-name.pseudo-class.css */
+/*      ^ -entity.other.attribute-name.pseudo-class.css */
 :future {}
 /* <- entity.other.attribute-name.pseudo-class.css punctuation.definition.entity.pseudo-class.css */
  /* <- entity.other.attribute-name.pseudo-class.css */