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-rw-r--r--lib/pp_control.mli2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pp_control.mli b/lib/pp_control.mli
index 24faf96f4d..3c008aaca1 100644
--- a/lib/pp_control.mli
+++ b/lib/pp_control.mli
@@ -37,7 +37,7 @@ val with_fp : 'a pp_formatter_params -> Format.formatter
val with_output_to : out_channel -> Format.formatter
val std_ft : Format.formatter ref
-val err_ft : Format.formatter
+val err_ft : Format.formatter ref
val deep_ft : Format.formatter
(*s For parametrization through vernacular. *)