diff --git a/src/helma/scripting/fesi/FesiEvaluator.java b/src/helma/scripting/fesi/FesiEvaluator.java
index 703b687e..2ccc4e15 100644
--- a/src/helma/scripting/fesi/FesiEvaluator.java
+++ b/src/helma/scripting/fesi/FesiEvaluator.java
@@ -64,7 +64,7 @@ public final class FesiEvaluator implements ScriptingEngine {
     
     // flag tells us if the current request has timed out
     // and exceptions should thus be rethrown as TimeoutExceptions.
-    private boolean timeout;
+    private volatile boolean timeout;
 
     /**
      *  Create a FESI evaluator for the given application and request evaluator.