diff --git a/vm/contexts.cpp b/vm/contexts.cpp
index 8480ee7bf7..c504da64f2 100644
--- a/vm/contexts.cpp
+++ b/vm/contexts.cpp
@@ -98,7 +98,6 @@ void factor_vm::delete_contexts() {
   FACTOR_ASSERT(!ctx);
   FACTOR_FOR_EACH(unused_contexts) {
     delete *iter;
-    iter++;
   }
 }