diff --git a/lib/carto/index.js b/lib/carto/index.js
index 9e73bcd..13de4b8 100644
--- a/lib/carto/index.js
+++ b/lib/carto/index.js
@@ -38,7 +38,7 @@ var carto = {
         error = options.indent + error.join('\n' + options.indent) + '\033[0m\n';
 
         message = options.indent + message + stylize(ctx.message, 'red');
-        ctx.filename && (message += stylize(' in ', 'red') + ctx.filename);
+        if (ctx.filename) (message += stylize(' in ', 'red') + ctx.filename);
 
         util.error(message, error);
 
@@ -51,7 +51,7 @@ var carto = {
 };
 
 [ 'call', 'color', 'comment', 'definition', 'dimension',
-  'directive', 'element', 'expression', 'filterset', 'filter', 'field',
+  'element', 'expression', 'filterset', 'filter', 'field',
   'keyword', 'layer', 'literal', 'operation', 'quoted', 'imagefilter',
   'reference', 'rule', 'ruleset', 'selector', 'style', 'url', 'value',
   'variable', 'zoom', 'invalid', 'fontset'
diff --git a/lib/carto/tree/directive.js b/lib/carto/tree/directive.js
deleted file mode 100644
index 9fb4aba..0000000
--- a/lib/carto/tree/directive.js
+++ /dev/null
@@ -1,39 +0,0 @@
-(function(tree) {
-
-tree.Directive = function Directive(name, value) {
-    this.name = name;
-    if (Array.isArray(value)) {
-        this.ruleset = new tree.Ruleset([], value);
-    } else {
-        this.value = value;
-    }
-};
-tree.Directive.prototype = {
-    toString: function(ctx, env) {
-        if (this.ruleset) {
-            this.ruleset.root = true;
-            return this.name + ' {\n  ' +
-                   this.ruleset.toString(ctx, env).trim().replace(/\n/g, '\n  ') +
-                               '\n}\n';
-        } else {
-            return this.name + ' ' + this.value.toString() + ';\n';
-        }
-    },
-    eval: function(env) {
-        env.frames.unshift(this);
-        this.ruleset = this.ruleset && this.ruleset.eval(env);
-        env.frames.shift();
-        return this;
-    },
-    variable: function(name) {
-        return tree.Ruleset.prototype.variable.call(this.ruleset, name);
-    },
-    find: function() {
-        return tree.Ruleset.prototype.find.apply(this.ruleset, arguments);
-    },
-    rulesets: function() {
-        return tree.Ruleset.prototype.rulesets.apply(this.ruleset);
-    }
-};
-
-})(require('../tree'));