diff --git a/lib/less/parser.js b/lib/less/parser.js
index ac77b407..30f3da67 100644
--- a/lib/less/parser.js
+++ b/lib/less/parser.js
@@ -727,7 +727,7 @@ less.Parser = function Parser(env) {
             // file-system operation. The function used for importing is
             // stored in `import`, which we pass to the Import constructor.
             //
-            import: function () {
+            "import": function () {
                 var path;
                 if ($(/@import\s+/g) &&
                     (path = $(this.entities.quoted) || $(this.entities.url)) &&
@@ -746,7 +746,7 @@ less.Parser = function Parser(env) {
 
                 if (input[i] !== '@') return;
 
-                if (value = $(this.import)) {
+                if (value = $(this['import'])) {
                     return value;
                 } else if (name = $(/@media|@page/g)) {
                     types = $(/[a-z:, ]+/g).trim();