diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 91d4997..98d67b8 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -179,6 +179,11 @@
 
 #if MDB_DEVEL && (defined(_WIN32) || (defined(EOWNERDEAD) && !defined(MDB_USE_POSIX_SEM)))
 #define MDB_ROBUST_SUPPORTED	1
+#endif
+#ifdef MDB_ROBUST_SUPPORTED
+#define ROBUST_FLAG MDB_ROBUST
+#else
+#define ROBUST_FLAG 0
 #endif
 
 	/** Wrapper around __func__, which is a C99 feature */