diff --git a/rtemsbsd/include/machine/rtems-bsd-user-space.h b/rtemsbsd/include/machine/rtems-bsd-user-space.h
index b4f74a55..b57a3ff9 100644
--- a/rtemsbsd/include/machine/rtems-bsd-user-space.h
+++ b/rtemsbsd/include/machine/rtems-bsd-user-space.h
@@ -57,6 +57,10 @@
 
 #define _POSIX2_LINE_MAX 128
 
+#ifndef CLOCK_MONOTONIC_FAST
+#define	CLOCK_MONOTONIC_FAST CLOCK_MONOTONIC
+#endif
+
 __BEGIN_DECLS
 
 /* FIXME: Add to Newlib */