diff --git a/web/src/main/java/lcsb/mapviewer/bean/UserBean.java b/web/src/main/java/lcsb/mapviewer/bean/UserBean.java
index 1b7a9aaa45e0ae153b6ff4109cc1804f8c8aef24..dc81b087845a53ba7b6151841ce965c55cd2467b 100644
--- a/web/src/main/java/lcsb/mapviewer/bean/UserBean.java
+++ b/web/src/main/java/lcsb/mapviewer/bean/UserBean.java
@@ -584,7 +584,7 @@ public class UserBean extends AbstractManagedBean {
 			authenticationToken = getUserService().login(Configuration.ANONYMOUS_LOGIN, "");
 		}
 		Calendar now = Calendar.getInstance();
-		now.add(-1, Calendar.MINUTE);
+		now.add(Calendar.MINUTE, -1);
 		if (authenticationToken.getExpires().after(now)) {
 			authenticationToken = getUserService().login(Configuration.ANONYMOUS_LOGIN, "");
 		}