diff --git a/src/toolsrc/codegen.pla b/src/toolsrc/codegen.pla
index 5da2328..69db278 100644
--- a/src/toolsrc/codegen.pla
+++ b/src/toolsrc/codegen.pla
@@ -525,12 +525,14 @@ def save_idlocal#0
     savelocals = locals
     savesize   = framesize
     savelast   = lastlocal
+    memcpy(heapmark, idlocal_tbl, lastlocal - idlocal_tbl)
     init_idlocal
 end
 def restore_idlocal#0
     locals    = savelocals
     framesize = savesize
     lastlocal = savelast
+    memcpy(idlocal_tbl, heapmark, lastlocal - idlocal_tbl)
 end
 //
 // Module dependency list