diff --git a/ext/mdbx_ext/database.c b/ext/mdbx_ext/database.c
index 93d3ad3..9d6fe7a 100644
--- a/ext/mdbx_ext/database.c
+++ b/ext/mdbx_ext/database.c
@@ -805,8 +805,13 @@ rmdbx_database_initialize( int argc, VALUE *argv, VALUE self )
 	if ( RTEST(opt) ) db->settings.env_flags = db->settings.env_flags | MDBX_NOSUBDIR;
 	opt = rb_hash_delete( opts, ID2SYM( rb_intern("no_readahead") ) );
 	if ( RTEST(opt) ) db->settings.env_flags = db->settings.env_flags | MDBX_NORDAHEAD;
+#if defined(HAVE_CONST_MDBX_NOSTICKYTHREADS)
 	opt = rb_hash_delete( opts, ID2SYM( rb_intern("no_stickythreads") ) );
 	if ( RTEST(opt) ) db->settings.env_flags = db->settings.env_flags | MDBX_NOSTICKYTHREADS;
+#else
+	opt = rb_hash_delete( opts, ID2SYM( rb_intern("no_threadlocal") ) );
+	if ( RTEST(opt) ) db->settings.env_flags = db->settings.env_flags | MDBX_NOTLS;
+#endif
 	opt = rb_hash_delete( opts, ID2SYM( rb_intern("readonly") ) );
 	if ( RTEST(opt) ) db->settings.env_flags = db->settings.env_flags | MDBX_RDONLY;
 	opt = rb_hash_delete( opts, ID2SYM( rb_intern("writemap") ) );
diff --git a/ext/mdbx_ext/extconf.rb b/ext/mdbx_ext/extconf.rb
index f266102..f07d24b 100755
--- a/ext/mdbx_ext/extconf.rb
+++ b/ext/mdbx_ext/extconf.rb
@@ -9,6 +9,8 @@ $CFLAGS << ' -Wno-unknown-warning-option'
 have_library( 'mdbx' )  or abort "No mdbx library!"
 have_header( 'mdbx.h' ) or abort "No mdbx.h header!"
 
+have_const( 'MDBX_NOSTICKYTHREADS', 'mdbx.h' )
+
 create_header()
 create_makefile( 'mdbx_ext' )