diff --git a/scheme/ikarus.conditions.ss b/scheme/ikarus.conditions.ss
index 257ee8a..730ed06 100644
--- a/scheme/ikarus.conditions.ss
+++ b/scheme/ikarus.conditions.ss
@@ -341,7 +341,7 @@
     make-no-nans-violation no-nans-violation?)
 
   ;;; ikarus-specific conditions
-  (define-condition-type &interrupted &condition
+  (define-condition-type &interrupted &serious
     make-interrupted-condition interrupted-condition?)
 
   (define-condition-type &i/o-would-block &condition
diff --git a/scheme/last-revision b/scheme/last-revision
index f7df7fd..31d5cbb 100644
--- a/scheme/last-revision
+++ b/scheme/last-revision
@@ -1 +1 @@
-1449
+1450