diff --git a/ChangeLog b/ChangeLog
index 728c5603a2..c043077324 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Oct 12 22:35:00 2011  Brent Roman  <brent@mbari.org>
+        
+	* fixed inverted NUL_P test in eval.c(cc_purge)
+        
 Mon Oct 11 17:55:00 2011  Brent Roman  <brent@mbari.org>
         
 	* always includes GC.stress method, even if MBARI_API enabled
diff --git a/eval.c b/eval.c
index 60b2be6830..4042eeb7ed 100644
--- a/eval.c
+++ b/eval.c
@@ -13446,7 +13446,7 @@ cc_purge(cc)
     rb_thread_t cc;
 {
     /* free continuation's stack if it has just died */
-    if (NIL_P(cc->thread) &&
+    if (!NIL_P(cc->thread) &&
         THREAD_DATA(cc->thread)->status == THREAD_KILLED) {
 	  cc->thread = Qnil;
 	  rb_thread_die(cc);  /* can't possibly activate this stack */