diff --git a/lib/parser.js b/lib/parser.js
index b9e5e3e..533767e 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -2,7 +2,7 @@
 
 var TOKEN    = /([!#\$%&'\*\+\-\.\^_`\|~0-9A-Za-z]+)/,
     NOTOKEN  = /([^!#\$%&'\*\+\-\.\^_`\|~0-9A-Za-z])/g,
-    QUOTED   = /"((?:\\[\x00-\x7f]|[^\x00-\x08\x0a-\x1f\x7f"])*)"/,
+    QUOTED   = /"((?:\\[\x00-\x7f]|[^\x00-\x08\x0a-\x1f\x7f"\\])*)"/,
     PARAM    = new RegExp(TOKEN.source + '(?:=(?:' + TOKEN.source + '|' + QUOTED.source + '))?'),
     EXT      = new RegExp(TOKEN.source + '(?: *; *' + PARAM.source + ')*', 'g'),
     EXT_LIST = new RegExp('^' + EXT.source + '(?: *, *' + EXT.source + ')*$'),
diff --git a/spec/parser_spec.js b/spec/parser_spec.js
index 4f85aff..f424648 100644
--- a/spec/parser_spec.js
+++ b/spec/parser_spec.js
@@ -78,6 +78,11 @@ test.describe("Parser", function() { with(this) {
       assertEqual( result.params.hasOwnProperty, true )
     }})
 
+    it("rejects a string missing its closing quote", function() { with(this) {
+      assertThrows(SyntaxError, function() {
+        parse('foo; bar="fooa\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a\\a')
+      })
+    }})
   }})
 
   describe("serializeParams", function() { with(this) {