diff --git a/src/ec.cpp b/src/ec.cpp
index 5d5a66c..a69cfef 100644
--- a/src/ec.cpp
+++ b/src/ec.cpp
@@ -64,6 +64,8 @@ Ec::Ec (Pd *own, mword sel, Pd *p, void (*f)(), unsigned c, unsigned e, mword u,
 
         trace (TRACE_SYSCALL, "EC:%p created (PD:%p CPU:%#x UTCB:%#lx ESP:%lx EVT:%#x)", this, p, c, u, s, e);
 
+        pd->insert_utcb (u, Buddy::ptr_to_phys(utcb) >> 12);
+
     } else {
 
         regs.dst_portal = NUM_VMI - 2;
diff --git a/src/space_mem.cpp b/src/space_mem.cpp
index 5341836..60e2fdc 100644
--- a/src/space_mem.cpp
+++ b/src/space_mem.cpp
@@ -132,12 +132,12 @@ void Space_mem::insert_root (uint64 s, uint64 e, mword a)
     }
 }
 
-bool Space_mem::insert_utcb (mword b)
+bool Space_mem::insert_utcb (mword b, mword phys)
 {
     if (!b)
         return true;
 
-    Mdb *mdb = new Mdb (this, 0, b >> PAGE_BITS, 0);
+    Mdb *mdb = new Mdb (this, phys, b >> PAGE_BITS, 0, 0x3);
 
     if (tree_insert (mdb))
         return true;
diff --git a/include/space_mem.h b/include/space_mem.h
index e155dad..1584395 100644
--- a/include/space_mem.h
+++ b/include/space_mem.h
@@ -68,7 +68,7 @@ class Space_mem : public Space
         INIT
         void insert_root (uint64, uint64, mword = 0x7);
 
-        bool insert_utcb (mword);
+        bool insert_utcb (mword, mword = 0);
 
         void update (Mdb *, mword = 0);