diff --git a/source/de/anomic/server/serverCodings.java b/source/de/anomic/server/serverCodings.java
index 50198165c..bd48a266c 100644
--- a/source/de/anomic/server/serverCodings.java
+++ b/source/de/anomic/server/serverCodings.java
@@ -50,6 +50,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.InputStream;
 import java.security.MessageDigest;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -175,10 +176,10 @@ public final class serverCodings {
 	return p;
     }
     
-    public static HashMap string2map(String string, String separator) {
+    public static Map string2map(String string, String separator) {
         // this can be used to parse a Map.toString() into a Map again
         if (string == null) return null;
-        HashMap map = new HashMap();
+        Map map = Collections.synchronizedMap(new HashMap());
         int pos;
         if ((pos = string.indexOf("{")) >= 0) string = string.substring(pos + 1).trim();
         if ((pos = string.lastIndexOf("}")) >= 0) string = string.substring(0, pos).trim();
@@ -210,7 +211,7 @@ public final class serverCodings {
     public static Set string2set(String string, String separator) {
         // this can be used to parse a Map.toString() into a Map again
         if (string == null) return null;
-        HashSet set = new HashSet();
+        Set set = Collections.synchronizedSet(new HashSet());
         int pos;
         if ((pos = string.indexOf("{")) >= 0) string = string.substring(pos + 1).trim();
         if ((pos = string.lastIndexOf("}")) >= 0) string = string.substring(0, pos).trim();
diff --git a/source/de/anomic/yacy/yacySeed.java b/source/de/anomic/yacy/yacySeed.java
index a5e97e38c..f8da02b53 100644
--- a/source/de/anomic/yacy/yacySeed.java
+++ b/source/de/anomic/yacy/yacySeed.java
@@ -64,6 +64,7 @@ import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.net.InetAddress;
+import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
@@ -164,7 +165,7 @@ public class yacySeed {
     }
 
     public yacySeed(String theHash) {
-        this.dna = new HashMap();
+        this.dna = Collections.synchronizedMap(new HashMap());
 
         // settings that can only be computed by originating peer:
         // at first startup -
@@ -616,7 +617,7 @@ public class yacySeed {
         if (seedStr == null) { return null; }
         final String seed = crypt.simpleDecode(seedStr, key);
         if (seed == null) { return null; }
-        final HashMap dna = serverCodings.string2map(seed, ",");
+        final Map dna = serverCodings.string2map(seed, ",");
         final String hash = (String) dna.remove(yacySeed.HASH);
         final yacySeed resultSeed = new yacySeed(hash, dna);
         if (properTest) {