diff --git a/src/main/java/de/thm/arsnova/controller/v2/AuthenticationController.java b/src/main/java/de/thm/arsnova/controller/v2/AuthenticationController.java
index 5dff6b13a764afc96cde84ac19f51e84646229a0..c6065c0e25195ff1a50f6842b7e5a0e6225c39a1 100644
--- a/src/main/java/de/thm/arsnova/controller/v2/AuthenticationController.java
+++ b/src/main/java/de/thm/arsnova/controller/v2/AuthenticationController.java
@@ -250,7 +250,7 @@ public class AuthenticationController extends AbstractController {
 		if (auth instanceof CasAuthenticationToken) {
 			return "redirect:" + apiPath + SecurityConfig.CAS_LOGOUT_PATH_SUFFIX;
 		}
-		return "redirect:" + request.getHeader("referer") != null ? request.getHeader("referer") : "/";
+		return "redirect:" + (request.getHeader("referer") != null ? request.getHeader("referer") : "/");
 	}
 
 	@GetMapping("/services")