diff --git a/lib/librumpuser/rumpuser_port.h b/lib/librumpuser/rumpuser_port.h
index 26c072f23..f29bb81ce 100644
--- a/lib/librumpuser/rumpuser_port.h
+++ b/lib/librumpuser/rumpuser_port.h
@@ -16,9 +16,9 @@
 #define HAVE_CHFLAGS 1
 #define HAVE_CLOCKID_T 1
 #define HAVE_CLOCK_GETTIME 1
-#define HAVE_CLOCK_NANOSLEEP 1
+//#define HAVE_CLOCK_NANOSLEEP 1
 #define HAVE_DLINFO 1
-#define HAVE_FSYNC_RANGE 1
+//#define HAVE_FSYNC_RANGE 1
 #define HAVE_GETENV_R 1
 #define HAVE_GETPROGNAME 1
 #define HAVE_GETSUBOPT 1