diff --git a/bin/lessc b/bin/lessc
index 02be342..c2b1628 100755
--- a/bin/lessc
+++ b/bin/lessc
@@ -68,6 +68,7 @@ fs.stat(input, function (e, stats) {
             }).parse(data, function (err, tree) {
                 if (err) {
                     less.writeError(err);
+                    process.exit(1);
                 } else {
                     try {
                         css = tree.toCSS({ compress: options.compress });
@@ -79,6 +80,7 @@ fs.stat(input, function (e, stats) {
                         }
                     } catch (e) {
                         less.writeError(e);
+                        process.exit(2);
                     }
                 }
             });
diff --git a/lib/less/index.js b/lib/less/index.js
index a103d77..e01efb8 100644
--- a/lib/less/index.js
+++ b/lib/less/index.js
@@ -40,7 +40,7 @@ var less = {
         var error = [];
 
         if (ctx.stack) {
-            return require('sys').puts(ctx.stack);
+            return require('sys').error(ctx.stack);
         }
 
         if (typeof(extract[0]) === 'string') {
@@ -56,8 +56,8 @@ var less = {
         }
         error = error.join('\n') + '\033[0m\n';
 
-        require('sys').puts(stylize(ctx.message + ' of ', 'red') +
-                            ctx.filename + ': ', error);
+        require('sys').error(stylize(ctx.message + ' of ', 'red') +
+                             ctx.filename + ': ', error);
     }
 };
 
@@ -87,13 +87,13 @@ less.Parser.importer = function (file, paths, callback) {
 
     if (pathname) {
         fs.stat(pathname, function (e, stats) {
-            if (e) sys.puts(e);
+            if (e) sys.error(e);
 
             fs.open(pathname, process.O_RDONLY, stats.mode, function (e, fd) {
-                if (e) sys.puts(e);
+                if (e) sys.error(e);
 
                 fs.read(fd, stats.size, 0, "utf8", function (e, data) {
-                    if (e) sys.puts(e);
+                    if (e) sys.error(e);
 
                     new(less.Parser)({
                         paths: [path.dirname(pathname)],
@@ -106,7 +106,7 @@ less.Parser.importer = function (file, paths, callback) {
             });
         });
     } else {
-        sys.puts("file '" + file + "' wasn't found.\n");
+        sys.error("file '" + file + "' wasn't found.\n");
         process.exit(1);
     }
 }