diff --git a/c/src/lib/libbsp/powerpc/beatnik/network/support/bsp_attach.c b/c/src/lib/libbsp/powerpc/beatnik/network/support/bsp_attach.c
index 8dae0cae3a..0f29a2c557 100644
--- a/c/src/lib/libbsp/powerpc/beatnik/network/support/bsp_attach.c
+++ b/c/src/lib/libbsp/powerpc/beatnik/network/support/bsp_attach.c
@@ -53,6 +53,8 @@
  * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03
  */ 
 
+#include <unistd.h>
+
 #include <rtems.h>
 #include <rtems/rtems_bsdnet.h>