diff --git a/engine/src/core/com/jme3/texture/FrameBuffer.java b/engine/src/core/com/jme3/texture/FrameBuffer.java
index c34879400..1beb1976a 100644
--- a/engine/src/core/com/jme3/texture/FrameBuffer.java
+++ b/engine/src/core/com/jme3/texture/FrameBuffer.java
@@ -290,6 +290,7 @@ public class FrameBuffer extends NativeObject {
             throw new IllegalArgumentException("The target at " + index + " is not set!");
 
         colorBufIndex = index;
+        setRefreshNeeded();
     }
 
     /**