diff --git a/lib/regex.js b/lib/regex.js
index 4c61fac..6a8299f 100644
--- a/lib/regex.js
+++ b/lib/regex.js
@@ -1,6 +1,6 @@
 module.exports = {
   section: /^\s*\[\s*([^\]]*?)\s*\]\s*$/,
-  param: /^\s*([\w@:._\-/[\]]+)\s*(?:=\s*(.*?)\s*)?$/,
+  param: /^\s*([\w@:._+\-/[\]]+)\s*(?:=\s*(.*?)\s*)?$/,
   comment: /^\s*[;#].*$/,
   line: /^\s*(.*?)\s*$/,
   blank: /^\s*$/,