diff --git a/src/core.c b/src/core.c
index 33b39ecc..ecd34972 100644
--- a/src/core.c
+++ b/src/core.c
@@ -10179,7 +10179,13 @@ int __cold mdbx_env_open(MDBX_env *env, const char *pathname, unsigned flags,
       rc = errno;
       goto bailout;
     }
-    mode = st.st_mode;
+    mode = (/* inherit read permissions for group and others */ st.st_mode &
+            (S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)) |
+           /* always add read/write/search for owner */ S_IRUSR | S_IWUSR |
+           ((st.st_mode & S_IRGRP) ? /* +write if readable by group */ S_IWGRP
+                                   : 0) |
+           ((st.st_mode & S_IROTH) ? /* +write if readable by others */ S_IWOTH
+                                   : 0);
   }
 #endif /* !Windows */
   const int lck_rc = mdbx_setup_lck(env, lck_pathname, mode);