diff --git a/Dnn.AdminExperience/Extensions/Content/Dnn.PersonaBar.Extensions/WebApps/Sites.Web/src/components/CreatePortal/index.jsx b/Dnn.AdminExperience/Extensions/Content/Dnn.PersonaBar.Extensions/WebApps/Sites.Web/src/components/CreatePortal/index.jsx
index 07fe4fce9c1..d56d0b89d2d 100644
--- a/Dnn.AdminExperience/Extensions/Content/Dnn.PersonaBar.Extensions/WebApps/Sites.Web/src/components/CreatePortal/index.jsx
+++ b/Dnn.AdminExperience/Extensions/Content/Dnn.PersonaBar.Extensions/WebApps/Sites.Web/src/components/CreatePortal/index.jsx
@@ -88,7 +88,7 @@ class CreatePortal extends Component {
             if (newPortal.SiteAlias !== "" && newPortal.SiteAlias.indexOf(rootDomain) === -1) {
                 newPortal.SiteAlias = rootDomain + "/" + newPortal.SiteAlias;
             } else {
-                newPortal.SiteAlias = rootDomain + "/" + newPortal.SiteName;
+                newPortal.SiteAlias = rootDomain + "/" + newPortal.SiteName.replace(/[^a-zA-Z0-9-_]/g, '');
             }
             error.SiteAlias = this.resolveSiteAliasError(newPortal.SiteAlias, isChildSite);
             this.setState({ newPortal, error });