diff --git a/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuTokenService.java b/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuTokenService.java
index 4d63e75..8741553 100644
--- a/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuTokenService.java
+++ b/full/src/main/java/de/ids_mannheim/korap/oauth2/oltu/service/OltuTokenService.java
@@ -348,6 +348,7 @@
             throws OAuthSystemException, KustvaktException {
 
         String random = randomGenerator.createRandomCode();
+        random += randomGenerator.createRandomCode();
         if (isPublicClient){
             return createsAccessTokenResponse(scopes, accessScopes, clientId,
                     userId, authenticationTime);
@@ -366,6 +367,7 @@
             throws OAuthSystemException, KustvaktException {
 
         String accessToken = randomGenerator.createRandomCode();
+        accessToken +=randomGenerator.createRandomCode();
         tokenDao.storeAccessToken(accessToken, refreshToken, accessScopes,
                 userId, clientId, authenticationTime);
 
@@ -383,6 +385,7 @@
             throws OAuthSystemException, KustvaktException {
 
         String accessToken = randomGenerator.createRandomCode();
+        accessToken +=randomGenerator.createRandomCode();
         tokenDao.storeAccessToken(accessToken, null, accessScopes,
                 userId, clientId, authenticationTime);
 
diff --git a/full/src/main/resources/kustvakt.conf b/full/src/main/resources/kustvakt.conf
index a9086ba..daf0e9a 100644
--- a/full/src/main/resources/kustvakt.conf
+++ b/full/src/main/resources/kustvakt.conf
@@ -69,8 +69,8 @@
 oauth2.client.credentials.scopes = client_info
 
 ## see SecureRandom Number Generation Algorithms
-## default SHA1PRNG
-security.secure.random.algorithm=SHA1PRNG
+## optional
+# security.secure.random.algorithm=SHA1PRNG
 
 ## see MessageDigest Algorithms
 ## default MD5