diff --git a/source/net/yacy/kelondro/util/GenerationMemoryStrategy.java b/source/net/yacy/kelondro/util/GenerationMemoryStrategy.java
index 508897d94..49b7ae407 100644
--- a/source/net/yacy/kelondro/util/GenerationMemoryStrategy.java
+++ b/source/net/yacy/kelondro/util/GenerationMemoryStrategy.java
@@ -29,6 +29,7 @@ import java.lang.management.ManagementFactory;
 import java.lang.management.MemoryMXBean;
 import java.lang.management.MemoryPoolMXBean;
 import java.lang.management.MemoryUsage;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 public class GenerationMemoryStrategy extends MemoryStrategy {
 	
@@ -102,11 +103,11 @@ public class GenerationMemoryStrategy extends MemoryStrategy {
      * @param force specifies whether ignoring preferred size
      * @return whether enough memory could be freed (or is free) or not
      */
-    protected final boolean request(final long size, final boolean force, boolean shortStatus) {
+    protected final boolean request(final long size, final boolean force, AtomicBoolean shortStatus) {
     	if (size == 0l) return true; // does not make sense to check - returning true without setting shortStatus (which also doesn't make sense to me)
     	final boolean unknown = size < 0l; // size < 0 indicate an unknown size - maybe from gziped streams
-    	final boolean r = unknown? properState(force) : size < available(force);
-        shortStatus = !r;
+    	final boolean r = unknown ? properState(force) : size < available(force);
+        shortStatus.set(!r);
         return r;
     }
     
diff --git a/source/net/yacy/kelondro/util/MemoryControl.java b/source/net/yacy/kelondro/util/MemoryControl.java
index 09b2c18dc..6dae52721 100644
--- a/source/net/yacy/kelondro/util/MemoryControl.java
+++ b/source/net/yacy/kelondro/util/MemoryControl.java
@@ -26,13 +26,15 @@
 package net.yacy.kelondro.util;
 
 import java.lang.management.ManagementFactory;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 /**
  * Use this to get information about memory usage or try to free some memory
  */
 public class MemoryControl {
 
-    private static boolean shortStatus = false, simulatedShortStatus = false, usingStandardStrategy = true;
+    private static AtomicBoolean shortStatus = new AtomicBoolean(false);
+    private static boolean simulatedShortStatus = false, usingStandardStrategy = true;
     private static MemoryStrategy strategy;
 
     private static MemoryStrategy getStrategy() {
@@ -145,7 +147,7 @@ public class MemoryControl {
      */
     public static boolean shortStatus() {
         //if (shortStatus) System.out.println("**** SHORT MEMORY ****");
-        return simulatedShortStatus || shortStatus;
+        return simulatedShortStatus || shortStatus.get();
     }
 
     /**
diff --git a/source/net/yacy/kelondro/util/MemoryStrategy.java b/source/net/yacy/kelondro/util/MemoryStrategy.java
index 4d68b3863..72fb9172a 100644
--- a/source/net/yacy/kelondro/util/MemoryStrategy.java
+++ b/source/net/yacy/kelondro/util/MemoryStrategy.java
@@ -25,6 +25,8 @@
 
 package net.yacy.kelondro.util;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 import net.yacy.cora.util.ConcurrentLog;
 
 public abstract class MemoryStrategy {
@@ -115,7 +117,7 @@ public abstract class MemoryStrategy {
      * @param force specifies whether a GC should be run even in case former GCs didn't provide enough memory
      * @return whether enough memory could be freed (or is free) or not
      */
-	protected abstract boolean request(final long size, final boolean force, boolean shortStatus);
+	protected abstract boolean request(final long size, final boolean force, AtomicBoolean shortStatus);
 
 	/**
      * @return if Memory seams to be in a proper state
diff --git a/source/net/yacy/kelondro/util/StandardMemoryStrategy.java b/source/net/yacy/kelondro/util/StandardMemoryStrategy.java
index 39c70e168..cab62b73e 100644
--- a/source/net/yacy/kelondro/util/StandardMemoryStrategy.java
+++ b/source/net/yacy/kelondro/util/StandardMemoryStrategy.java
@@ -25,6 +25,8 @@
 
 package net.yacy.kelondro.util;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 import net.yacy.cora.util.Memory;
 
 /**
@@ -146,10 +148,10 @@ public class StandardMemoryStrategy extends MemoryStrategy {
      * @return whether enough memory could be freed (or is free) or not
      */
     @Override
-    protected boolean request(final long size, final boolean force, boolean shortStatus) {
+    protected boolean request(final long size, final boolean force, AtomicBoolean shortStatus) {
         if (size <= 0) return true;
         final boolean r = request0(size, force);
-        shortStatus = !r;
+        shortStatus.set(!r);
         return r;
     }
     private boolean request0(final long size, final boolean force) {