diff --git a/src/mdbx_chk.c b/src/mdbx_chk.c
index e05a10c5..e9003573 100644
--- a/src/mdbx_chk.c
+++ b/src/mdbx_chk.c
@@ -93,7 +93,7 @@ struct {
 #define dbi_main walk.dbi[MAIN_DBI]
 #define dbi_meta walk.dbi[CORE_DBS]
 
-int envflags = MDBX_RDONLY | MDBX_EXCLUSIVE;
+int envflags = MDBX_RDONLY | MDBX_EXCLUSIVE | MDBX_VALIDATION;
 MDBX_env *env;
 MDBX_txn *txn;
 MDBX_envinfo envinfo;
diff --git a/src/mdbx_dump.c b/src/mdbx_dump.c
index 0f57b599..170a5332 100644
--- a/src/mdbx_dump.c
+++ b/src/mdbx_dump.c
@@ -356,7 +356,9 @@ int main(int argc, char *argv[]) {
 
   rc = mdbx_env_open(
       env, envname,
-      envflags | (rescue ? MDBX_RDONLY | MDBX_EXCLUSIVE : MDBX_RDONLY), 0);
+      envflags | (rescue ? MDBX_RDONLY | MDBX_EXCLUSIVE | MDBX_VALIDATION
+                         : MDBX_RDONLY),
+      0);
   if (unlikely(rc != MDBX_SUCCESS)) {
     error("mdbx_env_open", rc);
     goto env_close;