diff --git a/test/css/import-once.css b/test/css/import-once.css
new file mode 100644
index 00000000..3a1ae250
--- /dev/null
+++ b/test/css/import-once.css
@@ -0,0 +1,9 @@
+@import "import-test-d.css";
+
+.mixin {
+  height: 10px;
+  color: #ff0000;
+}
+#import {
+  color: #ff0000;
+}
diff --git a/test/less/import-once.less b/test/less/import-once.less
new file mode 100644
index 00000000..739900a6
--- /dev/null
+++ b/test/less/import-once.less
@@ -0,0 +1,3 @@
+@import-once "import/import-test-a";
+@import-once "import/import-test-b";
+@import-once "import/import-test-c";
\ No newline at end of file