diff --git a/packages/less/src/less/tree/debug-info.js b/packages/less/src/less/tree/debug-info.js
index e23472190..804e71723 100644
--- a/packages/less/src/less/tree/debug-info.js
+++ b/packages/less/src/less/tree/debug-info.js
@@ -1,38 +1,37 @@
-class debugInfo {
-    constructor(context, ctx, lineSeparator) {
-        let result = '';
-        if (context.dumpLineNumbers && !context.compress) {
-            switch (context.dumpLineNumbers) {
-                case 'comments':
-                    result = debugInfo.asComment(ctx);
-                    break;
-                case 'mediaquery':
-                    result = debugInfo.asMediaQuery(ctx);
-                    break;
-                case 'all':
-                    result = debugInfo.asComment(ctx) + (lineSeparator || '') + debugInfo.asMediaQuery(ctx);
-                    break;
-            }
-        }
-        return result;
-    }
+function asComment(ctx) {
+    return `/* line ${ctx.debugInfo.lineNumber}, ${ctx.debugInfo.fileName} */\n`;
+}
 
-    static asComment(ctx) {
-        return `/* line ${ctx.debugInfo.lineNumber}, ${ctx.debugInfo.fileName} */\n`;
+function asMediaQuery(ctx) {
+    let filenameWithProtocol = ctx.debugInfo.fileName;
+    if (!/^[a-z]+:\/\//i.test(filenameWithProtocol)) {
+        filenameWithProtocol = `file://${filenameWithProtocol}`;
     }
+    return `@media -sass-debug-info{filename{font-family:${filenameWithProtocol.replace(/([.:\/\\])/g, function (a) {
+        if (a == '\\') {
+            a = '\/';
+        }
+        return `\\${a}`;
+    })}}line{font-family:\\00003${ctx.debugInfo.lineNumber}}}\n`;
+}
 
-    static asMediaQuery(ctx) {
-        let filenameWithProtocol = ctx.debugInfo.fileName;
-        if (!/^[a-z]+:\/\//i.test(filenameWithProtocol)) {
-            filenameWithProtocol = `file://${filenameWithProtocol}`;
+function debugInfo(context, ctx, lineSeparator) {
+    let result = '';
+    if (context.dumpLineNumbers && !context.compress) {
+        switch (context.dumpLineNumbers) {
+            case 'comments':
+                result = asComment(ctx);
+                break;
+            case 'mediaquery':
+                result = asMediaQuery(ctx);
+                break;
+            case 'all':
+                result = asComment(ctx) + (lineSeparator || '') + asMediaQuery(ctx);
+                break;
         }
-        return `@media -sass-debug-info{filename{font-family:${filenameWithProtocol.replace(/([.:\/\\])/g, function (a) {
-            if (a == '\\') {
-                a = '\/';
-            }
-            return `\\${a}`;
-        })}}line{font-family:\\00003${ctx.debugInfo.lineNumber}}}\n`;
     }
+    return result;
 }
 
 export default debugInfo;
+