diff --git a/assets/plugins/input-mask/jquery.inputmask.numeric.extensions.js b/assets/plugins/input-mask/jquery.inputmask.numeric.extensions.js
index 2efb33f4..2ce1f725 100644
--- a/assets/plugins/input-mask/jquery.inputmask.numeric.extensions.js
+++ b/assets/plugins/input-mask/jquery.inputmask.numeric.extensions.js
@@ -167,7 +167,7 @@ Optional extensions on the jquery.inputmask base
             regex: {
                 number: function (opts) {
                     var escapedGroupSeparator = $.inputmask.escapeRegex.call(this, opts.groupSeparator);
-                    var signedExpression = opts.allowPlus || opts.allowMinus ? "[" + (opts.allowPlus ? "\+" : "") + (opts.allowMinus ? "-" : "") + "]?" : "";
+                    var signedExpression = opts.allowPlus || opts.allowMinus ? "[" + (opts.allowPlus ? "+" : "") + (opts.allowMinus ? "-" : "") + "]?" : "";
                     return new RegExp("^" + signedExpression + "(\\d+|\\d{1," + opts.groupSize + "}((" + escapedGroupSeparator + "\\d{" + opts.groupSize + "})?)+)$");
                 }
             },