diff --git a/src/api-env.c b/src/api-env.c
index 2bfbdeb2..bd3702e9 100644
--- a/src/api-env.c
+++ b/src/api-env.c
@@ -648,7 +648,7 @@ __cold int mdbx_env_close_ex(MDBX_env *env, bool dont_sync) {
 #endif /* Windows */
   }
 
-  if (env->basal_txn && env->basal_txn->owner == osal_thread_self())
+  if (env->basal_txn && (MDBX_TXN_CHECKOWNER ? env->basal_txn->owner == osal_thread_self() : !!env->basal_txn->owner))
     lck_txn_unlock(env);
 
   eASSERT(env, env->signature.weak == 0);
diff --git a/src/api-extra.c b/src/api-extra.c
index 61b0fac9..32ad4bfd 100644
--- a/src/api-extra.c
+++ b/src/api-extra.c
@@ -117,7 +117,6 @@ __cold int mdbx_thread_unregister(const MDBX_env *env) {
     return MDBX_RESULT_TRUE /* not registered */;
 
   eASSERT(env, r->pid.weak == env->pid);
-  eASSERT(env, r->tid.weak == osal_thread_self());
   if (unlikely(r->pid.weak != env->pid || r->tid.weak != osal_thread_self()))
     return LOG_IFERR(MDBX_BAD_RSLOT);
 
@@ -154,8 +153,10 @@ int mdbx_txn_unlock(MDBX_env *env) {
 
   if (unlikely(env->flags & MDBX_RDONLY))
     return LOG_IFERR(MDBX_EACCESS);
+#if MDBX_TXN_CHECKOWNER
   if (unlikely(env->basal_txn->owner != osal_thread_self()))
     return LOG_IFERR(MDBX_THREAD_MISMATCH);
+#endif /* MDBX_TXN_CHECKOWNER */
   if (unlikely((env->basal_txn->flags & MDBX_TXN_FINISHED) == 0))
     return LOG_IFERR(MDBX_BUSY);
 
diff --git a/src/api-txn.c b/src/api-txn.c
index 1f24c930..2fe01a4e 100644
--- a/src/api-txn.c
+++ b/src/api-txn.c
@@ -101,11 +101,13 @@ int mdbx_txn_abort(MDBX_txn *txn) {
   if (unlikely(rc != MDBX_SUCCESS))
     return LOG_IFERR(rc);
 
+#if MDBX_TXN_CHECKOWNER
   if ((txn->flags & (MDBX_TXN_RDONLY | MDBX_NOSTICKYTHREADS)) == MDBX_NOSTICKYTHREADS &&
       unlikely(txn->owner != osal_thread_self())) {
     mdbx_txn_break(txn);
     return LOG_IFERR(MDBX_THREAD_MISMATCH);
   }
+#endif /* MDBX_TXN_CHECKOWNER */
 
   return LOG_IFERR(txn_abort(txn));
 }
@@ -420,11 +422,13 @@ int mdbx_txn_commit_ex(MDBX_txn *txn, MDBX_commit_latency *latency) {
     goto done;
   }
 
+#if MDBX_TXN_CHECKOWNER
   if (!txn->parent && (txn->flags & MDBX_NOSTICKYTHREADS) && unlikely(txn->owner != osal_thread_self())) {
     txn->flags |= MDBX_TXN_ERROR;
     rc = MDBX_THREAD_MISMATCH;
     return LOG_IFERR(rc);
   }
+#endif /* MDBX_TXN_CHECKOWNER */
 
   if (unlikely(txn->flags & MDBX_TXN_ERROR)) {
     rc = MDBX_RESULT_TRUE;
diff --git a/test/extra/txn.c++ b/test/extra/txn.c++
index d817cc7e..3a616015 100644
--- a/test/extra/txn.c++
+++ b/test/extra/txn.c++
@@ -131,6 +131,7 @@ int main(int argc, const char *argv[]) {
 
     std::thread t([&]() {
       s.wait();
+#if MDBX_TXN_CHECKOWNER
       err = mdbx_txn_reset(c_txn);
       assert(err == MDBX_THREAD_MISMATCH);
       ok = ok && err == MDBX_THREAD_MISMATCH;
@@ -143,6 +144,7 @@ int main(int argc, const char *argv[]) {
       err = mdbx_txn_abort(c_txn);
       assert(err == MDBX_THREAD_MISMATCH);
       ok = ok && err == MDBX_THREAD_MISMATCH;
+#endif /* MDBX_TXN_CHECKOWNER */
       err = mdbx_txn_begin(env, txn, MDBX_TXN_READWRITE, &c_txn);
       assert(err == MDBX_BAD_TXN);
       ok = ok && err == MDBX_BAD_TXN;