diff --git a/src/core.c b/src/core.c
index 9df0efef..f2aa0f1d 100644
--- a/src/core.c
+++ b/src/core.c
@@ -5494,6 +5494,7 @@ static __inline txnid_t meta_txnid(const MDBX_env *env, const MDBX_meta *meta,
   if (allow_volatile)
     return (a == b) ? a : 0;
   mdbx_assert(env, a == b);
+  (void)env;
   return a;
 }