diff --git a/configure b/configure
index 75751e4989..ce4d671669 100755
--- a/configure
+++ b/configure
@@ -7551,6 +7551,7 @@ if test "$_largefiles" = yes || freebsd ; then
     # dvdread support requires this (for off64_t)
     CFLAGS="$CFLAGS -D_LARGEFILE64_SOURCE"
     cygwin && CFLAGS="$CFLAGS -DSYS_CYGWIN"
+    beos && CFLAGS="$CFLAGS -DSYS_BEOS"
   fi
 fi