diff --git a/packages/pug-lexer/index.js b/packages/pug-lexer/index.js
index 434e3a048..79c2f244f 100644
--- a/packages/pug-lexer/index.js
+++ b/packages/pug-lexer/index.js
@@ -108,10 +108,10 @@ Lexer.prototype = {
 
   tok: function(type, val){
     var res = {
-      type: type, 
+      type: type,
       loc: {
         start: {
-          line: this.lineno, 
+          line: this.lineno,
           column: this.colno
         },
         filename: this.filename
@@ -122,15 +122,15 @@ Lexer.prototype = {
 
     return res;
   },
-  
+
   /**
    * Set the token's `loc.end` value.
-   * 
+   *
    * @param {Object} tok
    * @returns {Object}
    * @api private
    */
-  
+
   tokEnd: function(tok){
     tok.loc.end = {
       line: this.lineno,
@@ -1052,7 +1052,7 @@ Lexer.prototype = {
       return true;
     }
   },
-  
+
   /**
    * Attribute Name.
    */
@@ -1061,7 +1061,7 @@ Lexer.prototype = {
     var quoteRe = /['"]/;
     var key = '';
     var i;
-    
+
     // consume all whitespace before the key
     for(i = 0; i < str.length; i++){
       if(!this.whitespaceRe.test(str[i])) break;
@@ -1071,23 +1071,26 @@ Lexer.prototype = {
         this.incrementColumn(1);
       }
     }
-    
+
     if(i === str.length){
       return '';
     }
-    
+
     var tok = this.tok('attribute');
-    
+
     // quote?
     if(quoteRe.test(str[i])){
       quote = str[i];
       this.incrementColumn(1);
       i++;
+    }else if(characterParser.isPunctuator(str[i]) && str[i] !== ':'){
+      console.warn(this.filename + ', line ' + tok.loc.start.line + ', attribute name starts with invalid character "' + str[i] +
+                '", to use special characters in attribute names, wrap the attribute name in double quotes ""')
     }
-    
+
     // start looping through the key
     for (; i < str.length; i++) {
-      
+
       if(quote){
         if (str[i] === quote) {
           this.incrementColumn(1);
@@ -1099,20 +1102,20 @@ Lexer.prototype = {
           break;
         }
       }
-      
+
       key += str[i];
-        
+
       if (str[i] === '\n') {
         this.incrementLine(1);
       } else {
         this.incrementColumn(1);
       }
     }
-    
+
     tok.name = key;
-    
+
     var valueResponse = this.attributeValue(str.substr(i));
-    
+
     if (valueResponse.val) {
       tok.val = valueResponse.val;
       tok.mustEscape = valueResponse.mustEscape;
@@ -1121,11 +1124,11 @@ Lexer.prototype = {
       tok.val = true;
       tok.mustEscape = true;
     }
-    
+
     str = valueResponse.remainingSource;
-    
+
     this.tokens.push(this.tokEnd(tok));
-    
+
     for(i = 0; i < str.length; i++){
       if(!this.whitespaceRe.test(str[i])) {
         break;
@@ -1136,15 +1139,15 @@ Lexer.prototype = {
         this.incrementColumn(1);
       }
     }
-    
+
     if(str[i] === ','){
       this.incrementColumn(1);
       i++;
     }
-    
+
     return str.substr(i);
   },
-  
+
   /**
    * Attribute Value.
    */
@@ -1156,7 +1159,7 @@ Lexer.prototype = {
     var state = characterParser.defaultState();
     var col = this.colno;
     var line = this.lineno;
-    
+
     // consume all whitespace before the equals sign
     for(i = 0; i < str.length; i++){
       if(!this.whitespaceRe.test(str[i])) break;
@@ -1167,18 +1170,18 @@ Lexer.prototype = {
         col++;
       }
     }
-    
+
     if(i === str.length){
       return { remainingSource: str };
     }
-    
+
     if(str[i] === '!'){
       escapeAttr = false;
       col++;
       i++;
       if (str[i] !== '=') this.error('INVALID_KEY_CHARACTER', 'Unexpected character ' + str[i] + ' expected `=`');
     }
-    
+
     if(str[i] !== '='){
       // check for anti-pattern `div("foo"bar)`
       if (i === 0 && str && !this.whitespaceRe.test(str[0]) && str[0] !== ','){
@@ -1187,11 +1190,11 @@ Lexer.prototype = {
         return { remainingSource: str };
       }
     }
-    
+
     this.lineno = line;
     this.colno = col + 1;
     i++;
-    
+
     // consume all whitespace before the value
     for(; i < str.length; i++){
       if(!this.whitespaceRe.test(str[i])) break;
@@ -1201,18 +1204,18 @@ Lexer.prototype = {
         this.incrementColumn(1);
       }
     }
-    
+
     line = this.lineno;
     col = this.colno;
-    
+
     // start looping through the value
     for (; i < str.length; i++) {
       // if the character is in a string or in parentheses/brackets/braces
       if (!(state.isNesting() || state.isString())){
-        
+
         if (this.whitespaceRe.test(str[i])) {
           done = false;
-          
+
           // find the first non-whitespace character
           for (x = i; x < str.length; x++) {
             if (!this.whitespaceRe.test(str[x])) {
@@ -1224,24 +1227,24 @@ Lexer.prototype = {
               break;
             }
           }
-          
+
           // if everything else is whitespace, return now so last attribute
           // does not include trailing whitespace
           if(done || x === str.length){
             break;
           }
         }
-        
+
         // if there's no whitespace and the character is not ',', the
         // attribute did not end.
         if(str[i] === ',' && this.assertExpression(val, true)){
           break;
         }
       }
-      
+
       state = characterParser.parseChar(str[i], state);
       val += str[i];
-      
+
       if (str[i] === '\n') {
         line++;
         col = 1;
@@ -1249,22 +1252,22 @@ Lexer.prototype = {
         col++;
       }
     }
-    
+
     this.assertExpression(val);
-    
+
     this.lineno = line;
     this.colno = col;
-    
+
     return { val: val, mustEscape: escapeAttr, remainingSource: str.substr(i) };
   },
 
   /**
    * Attributes.
    */
-  
+
   attrs: function() {
     var tok;
-    
+
     if ('(' == this.input.charAt(0)) {
       tok = this.tok('start-attributes');
       var index = this.bracketExpression().end;
diff --git a/packages/pug/test/anti-cases/Invalid-Attribute-test/__snapshots__/invalid.test.js.snap b/packages/pug/test/anti-cases/Invalid-Attribute-test/__snapshots__/invalid.test.js.snap
new file mode 100644
index 000000000..5fe8d75b7
--- /dev/null
+++ b/packages/pug/test/anti-cases/Invalid-Attribute-test/__snapshots__/invalid.test.js.snap
@@ -0,0 +1,5 @@
+exports[`test invalid attribute name should log warning 1`] = `
+Array [
+"/home/travis/build/pugjs/pug/packages/pug/test/anti-cases/Invalid-Attribute-test/invalid-character.pug, line 1, attribute name starts with invalid character "{", to use special characters in attribute names, wrap the attribute name in double quotes """,
+]
+`;
diff --git a/packages/pug/test/anti-cases/Invalid-Attribute-test/invalid-character.pug b/packages/pug/test/anti-cases/Invalid-Attribute-test/invalid-character.pug
new file mode 100644
index 000000000..43008b602
--- /dev/null
+++ b/packages/pug/test/anti-cases/Invalid-Attribute-test/invalid-character.pug
@@ -0,0 +1 @@
+p({{bar}}) foo
diff --git a/packages/pug/test/anti-cases/Invalid-Attribute-test/invalid.test.js b/packages/pug/test/anti-cases/Invalid-Attribute-test/invalid.test.js
new file mode 100644
index 000000000..82ceeef9e
--- /dev/null
+++ b/packages/pug/test/anti-cases/Invalid-Attribute-test/invalid.test.js
@@ -0,0 +1,13 @@
+const pug = require('../../../');
+
+test('invalid attribute name should log warning', () => {
+  const oldWarn = console.warn;
+  const warnings = [];
+  console.warn = warnings.push.bind(warnings);
+  pug.compileFile(
+    __dirname + '/invalid-character.pug'
+  );
+  console.warn = oldWarn;
+  warnings.map(warning => warning.replace(/\\/g, '/').split(process.cwd().replace(/\\/g, '/')).join('<cwd>'));
+  expect(warnings).toMatchSnapshot();
+});