diff --git a/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuAuthorizationService.java b/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuAuthorizationService.java
index 5898beb..6aa82d1 100644
--- a/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuAuthorizationService.java
+++ b/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuAuthorizationService.java
@@ -39,7 +39,7 @@
     @Autowired
     private OAuth2ClientService clientService;
 
-    /**e.description("Redirect URI is required");
+    /**
      * Authorization code request does not require client
      * authentication, but only checks if the client id exists.
      * 
@@ -131,7 +131,7 @@
                 e.responseStatus(HttpStatus.SC_TEMPORARY_REDIRECT);
             }
             else {
-                e.description("Redirect URI is required");
+                e.description("Missing parameter: redirect URI");
             }
         }
 
@@ -181,7 +181,7 @@
             }
             else {
                 return new KustvaktException(StatusCodes.MISSING_REDIRECT_URI,
-                        "Redirect URI is required", OAuth2Error.INVALID_REQUEST);
+                        "Missing parameter: redirect URI", OAuth2Error.INVALID_REQUEST);
             }
         }
 
diff --git a/full/src/main/java/de/ids_mannheim/korap/oauth2/service/OAuth2AuthorizationService.java b/full/src/main/java/de/ids_mannheim/korap/oauth2/service/OAuth2AuthorizationService.java
index 581fa09..d2df86e 100644
--- a/full/src/main/java/de/ids_mannheim/korap/oauth2/service/OAuth2AuthorizationService.java
+++ b/full/src/main/java/de/ids_mannheim/korap/oauth2/service/OAuth2AuthorizationService.java
@@ -129,7 +129,7 @@
         }
         else {
             throw new KustvaktException(StatusCodes.MISSING_REDIRECT_URI,
-                    "Redirect URI is required",
+                    "Missing parameter: redirect URI",
                     OAuth2Error.INVALID_REQUEST);
         }
 
diff --git a/full/src/test/java/de/ids_mannheim/korap/web/controller/OAuth2ControllerTest.java b/full/src/test/java/de/ids_mannheim/korap/web/controller/OAuth2ControllerTest.java
index 9e586e4..82caebe 100644
--- a/full/src/test/java/de/ids_mannheim/korap/web/controller/OAuth2ControllerTest.java
+++ b/full/src/test/java/de/ids_mannheim/korap/web/controller/OAuth2ControllerTest.java
@@ -123,7 +123,7 @@
         JsonNode node = JsonUtils.readTree(entity);
         assertEquals(OAuthError.CodeResponse.INVALID_REQUEST,
                 node.at("/error").asText());
-        assertEquals("Redirect URI is required",
+        assertEquals("Missing parameter: redirect URI",
                 node.at("/error_description").asText());
         assertEquals(state, node.at("/state").asText());
     }
@@ -252,7 +252,7 @@
         node = JsonUtils.readTree(response.getEntity(String.class));
         assertEquals(OAuthError.CodeResponse.INVALID_REQUEST,
                 node.at("/error").asText());
-        assertEquals("Redirect URI is required",
+        assertEquals("Missing parameter: redirect URI",
                 node.at("/error_description").asText());
         assertEquals(state, node.at("/state").asText());
     }