diff --git a/engine/src/core/com/jme3/export/SavableClassUtil.java b/engine/src/core/com/jme3/export/SavableClassUtil.java
index d99372072..804990f82 100644
--- a/engine/src/core/com/jme3/export/SavableClassUtil.java
+++ b/engine/src/core/com/jme3/export/SavableClassUtil.java
@@ -185,13 +185,15 @@ public class SavableClassUtil {
         }
         
         String newClassName = remapClass(className);
-        for (ClassLoader classLoader : loaders){
-            try {
-                return (Savable) classLoader.loadClass(newClassName).newInstance();
-            } catch (InstantiationException e) {
-            } catch (IllegalAccessException e) {
-            }
+        synchronized(loaders) {
+            for (ClassLoader classLoader : loaders){
+                try {
+                    return (Savable) classLoader.loadClass(newClassName).newInstance();
+                } catch (InstantiationException e) {
+                } catch (IllegalAccessException e) {
+                }
 
+            }
         }
 
         return fromName(className);
diff --git a/engine/src/desktop/com/jme3/asset/DesktopAssetManager.java b/engine/src/desktop/com/jme3/asset/DesktopAssetManager.java
index 8a4003388..e1c25abd6 100644
--- a/engine/src/desktop/com/jme3/asset/DesktopAssetManager.java
+++ b/engine/src/desktop/com/jme3/asset/DesktopAssetManager.java
@@ -102,12 +102,15 @@ public class DesktopAssetManager implements AssetManager {
     public void addClassLoader(ClassLoader loader){
         if(classLoaders == null)
             classLoaders = Collections.synchronizedList(new ArrayList<ClassLoader>());
-        classLoaders.add(loader);
+        synchronized(classLoaders) {
+            classLoaders.add(loader);
+        }
     }
     
     public void removeClassLoader(ClassLoader loader){
-        if(classLoaders != null)
-            classLoaders.remove(loader);
+        if(classLoaders != null) synchronized(classLoaders) {
+                classLoaders.remove(loader);
+            }
     }
 
     public List<ClassLoader> getClassLoaders(){