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-rw-r--r--library/heads.ml3
1 files changed, 2 insertions, 1 deletions
diff --git a/library/heads.ml b/library/heads.ml
index 0faad827e..fa0393019 100644
--- a/library/heads.ml
+++ b/library/heads.ml
@@ -122,8 +122,9 @@ let compute_head = function
| EvalConstRef cst ->
let env = Global.env() in
let cb = Environ.lookup_constant cst env in
+ let is_Def = function Declarations.Def _ -> true | _ -> false in
let body =
- if cb.Declarations.const_proj = None
+ if cb.Declarations.const_proj = None && is_Def cb.Declarations.const_body
then Declareops.body_of_constant cb else None
in
(match body with