diff --git a/c/src/lib/libbsp/powerpc/psim/network/if_sim.c b/c/src/lib/libbsp/powerpc/psim/network/if_sim.c
index 240bf05e67..3bb1ec362d 100644
--- a/c/src/lib/libbsp/powerpc/psim/network/if_sim.c
+++ b/c/src/lib/libbsp/powerpc/psim/network/if_sim.c
@@ -31,6 +31,7 @@
 #endif
 
 #include <rtems/rtems_bsdnet.h>
+#include <sys/param.h>
 #include <sys/mbuf.h>
 #include <sys/socket.h>
 #include <sys/sockio.h>