diff --git a/console/yap.c b/console/yap.c
index 2c0ea6cbc..2d2e198fe 100644
--- a/console/yap.c
+++ b/console/yap.c
@@ -676,6 +676,7 @@ init_standard_system(int argc, char *argv[], YAP_init_args *iap)
   iap->HeapSize = 0;
   iap->StackSize = 0;
   iap->TrailSize = 0;
+  iap->AttsSize = 0;
   iap->YapLibDir = NULL;
   iap->YapPrologBootFile = NULL;
   iap->YapPrologInitFile = NULL;