diff --git a/tools/comcom.lisp b/tools/comcom.lisp
index c8f5339354527a6ae3488bc1122a6cf6ac7b0ca8..4f2e0d56c438cf0dcbf6c21cb5d53954728618d5 100644
--- a/tools/comcom.lisp
+++ b/tools/comcom.lisp
@@ -46,6 +46,7 @@
 (when (string= (old-c:backend-name old-c:*backend*) "RT")
   (comf "target:compiler/rt/params" :proceed t))
 (comf "target:compiler/generic/objdef" :proceed t)
+(comf "target:compiler/generic/interr")
 
 (comf "target:code/struct") ; For defstruct description structures.
 (comf "target:compiler/proclaim") ; For COOKIE structure.