diff --git a/spec/libsass-todo-issues/issue_2031/expected_output.css b/spec/libsass-todo-issues/issue_2031/expected_output.css
new file mode 100644
index 0000000000..2f8f29e8ea
--- /dev/null
+++ b/spec/libsass-todo-issues/issue_2031/expected_output.css
@@ -0,0 +1,8 @@
+:not(.asd, .qwe) {
+  content: test; }
+
+:not(.foo):not(.bar):not(.baz) {
+  content: test; }
+
+test {
+  content: :not(.foo):not(.bar); }
diff --git a/spec/libsass-todo-issues/issue_2031/input.scss b/spec/libsass-todo-issues/issue_2031/input.scss
new file mode 100644
index 0000000000..a18b569f73
--- /dev/null
+++ b/spec/libsass-todo-issues/issue_2031/input.scss
@@ -0,0 +1,13 @@
+:not(.asd, .qwe) {
+  content: test;
+}
+:not(.foo) {
+  content: test;
+}
+.bar, .baz {
+  @extend .foo;
+}
+
+test {
+  content: selector-extend(":not(.foo)", ".foo", ".bar");
+}
\ No newline at end of file