diff --git a/test/css/mixins-important.css b/test/css/mixins-important.css
new file mode 100644
index 00000000..2f74c647
--- /dev/null
+++ b/test/css/mixins-important.css
@@ -0,0 +1,17 @@
+.class {
+  border: 1;
+  boxer: 1;
+  border: 2 !important;
+  boxer: 2 !important;
+  border: 3;
+  boxer: 3;
+  border: 4 !important;
+  boxer: 4 !important;
+  border: 5;
+  boxer: 5;
+  border: 0 !important;
+  boxer: 0 !important;
+  border: 9 !important;
+  border: 9;
+  boxer: 9;
+}
diff --git a/test/less/mixins-important.less b/test/less/mixins-important.less
new file mode 100644
index 00000000..790a4d6e
--- /dev/null
+++ b/test/less/mixins-important.less
@@ -0,0 +1,18 @@
+
+.mixin (9) {
+  border: 9 !important;  
+}
+.mixin (@a: 0) {
+  border: @a;
+  boxer: @a;
+}
+
+.class {
+  .mixin(1);
+  .mixin(2) !important;
+  .mixin(3);
+  .mixin(4) !important;
+  .mixin(5);
+  .mixin !important;
+  .mixin(9);
+}