diff --git a/IframeOptions.ascx b/IframeOptions.ascx
index 13d85d7..e4c5202 100644
--- a/IframeOptions.ascx
+++ b/IframeOptions.ascx
@@ -34,7 +34,7 @@
                CssClass="dnnFormMessage dnnFormError"
                ForeColor="White"
                ResourceKey="SourceUrlValidator.ErrorMessage"
-               ValidationExpression="http(s)?:\/\/([\w-]+\.)+[\w-]+(\/[\w- .\/?%&=!+]*)?"
+               ValidationExpression="http(s)?:\/\/([\w-]+\.)+[\w-]+(\/[\w- .\/?%&=,!+]*)?"
                ValidationGroup="IFrameParametersValidation" />
             <asp:RequiredFieldValidator ID="SourceUrlRequiredValidator" runat="server"
                ControlToValidate="SourceUrl$txtUrl"