diff --git a/source/net/yacy/server/serverSwitch.java b/source/net/yacy/server/serverSwitch.java
index eae42215b..69fabc3e0 100644
--- a/source/net/yacy/server/serverSwitch.java
+++ b/source/net/yacy/server/serverSwitch.java
@@ -113,26 +113,24 @@ public class serverSwitch {
 
 		// remove all values from config that do not appear in init
 		this.configRemoved = new ConcurrentHashMap<String, String>();
-		synchronized (this.configProps) {
-			Iterator<String> i = this.configProps.keySet().iterator();
-			String key;
-			while (i.hasNext()) {
-				key = i.next();
-				if (!(initProps.containsKey(key))) {
-					this.configRemoved.put(key, this.configProps.get(key));
-					i.remove();
-				}
+		Iterator<String> i = this.configProps.keySet().iterator();
+		String key;
+		while (i.hasNext()) {
+			key = i.next();
+			if (!(initProps.containsKey(key))) {
+				this.configRemoved.put(key, this.configProps.get(key));
+				i.remove();
 			}
+		}
 
-			// merge new props from init to config
-			// this is necessary for migration, when new properties are attached
-			initProps.putAll(this.configProps);
-			this.configProps = initProps;
+		// merge new props from init to config
+		// this is necessary for migration, when new properties are attached
+		initProps.putAll(this.configProps);
+		this.configProps = initProps;
 
-			// save result; this may initially create a config file after
-			// initialization
-			saveConfig();
-		}
+		// save result; this may initially create a config file after
+		// initialization
+		saveConfig();
 
 		// init thread control
 		this.workerThreads = new TreeMap<String, BusyThread>();