diff --git a/mdbx.h b/mdbx.h
index 0e8ee9fe..f09b867d 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -824,15 +824,21 @@ enum MDBX_constants {
 /* THE FILES *******************************************************************
  * At the file system level, the environment corresponds to a pair of files. */
 
+#ifndef MDBX_LOCKNAME
 /** \brief The name of the lock file in the environment
  * without using \ref MDBX_NOSUBDIR */
 #define MDBX_LOCKNAME "/mdbx.lck"
+#endif
+#ifndef MDBX_DATANAME
 /** \brief The name of the data file in the environment
  * without using \ref MDBX_NOSUBDIR */
 #define MDBX_DATANAME "/mdbx.dat"
+#endif
 
+#ifndef MDBX_LOCK_SUFFIX
 /** \brief The suffix of the lock file when \ref MDBX_NOSUBDIR is used */
 #define MDBX_LOCK_SUFFIX "-lck"
+#endif
 
 /* DEBUG & LOGGING ************************************************************/