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-rw-r--r--byterun/hash.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/byterun/hash.c b/byterun/hash.c
index 13709d4a7..a1d7864db 100644
--- a/byterun/hash.c
+++ b/byterun/hash.c
@@ -142,7 +142,7 @@ static void hash_aux(value obj)
/* Hashing variant tags */
-CAMLexport value caml_hash_variant(char * tag)
+CAMLexport value caml_hash_variant(char const * tag)
{
value accu;
/* Same hashing algorithm as in ../typing/btype.ml, function hash_variant */