--- a/core/src/lib/mntent_cache.cc
+++ b/core/src/lib/mntent_cache.cc
@@ -56,6 +56,10 @@
  *  Marco van Wieringen, August 2009
  */
 
+#ifndef _PATH_MOUNTED
+# define _PATH_MOUNTED "/proc/mounts"
+#endif
+
 #include "include/bareos.h"
 #include "mntent_cache.h"
 #include "lib/dlist.h"