diff --git a/test/main.cc b/test/main.cc
index fe67c103..c201c20e 100644
--- a/test/main.cc
+++ b/test/main.cc
@@ -134,9 +134,8 @@ void actor_params::set_defaults(const std::string &tmpdir) {
   table_flags = MDBX_DUPSORT;
 
   size_lower = -1;
-  size_now =
-      intptr_t(1024) * 1024 * ((table_flags & MDBX_DUPSORT) ? 256 : 1024);
-  size_now = std::max(size_now, mdbx_limits_dbsize_max(-1));
+  size_now = intptr_t((table_flags & MDBX_DUPSORT) ? 256 : 1024) << 20;
+  size_now = std::min(size_now, mdbx_limits_dbsize_max(-1));
   size_upper = -1;
   shrink_threshold = -1;
   growth_step = -1;