diff --git a/configure.ac b/configure.ac
index 5db2e4e..52b4cc1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -114,7 +114,7 @@ dnl ************************************
 dnl *** Check for standard functions ***
 dnl ************************************
 AC_FUNC_MMAP()
-#AC_CHECK_FUNCS([])
+AC_CHECK_FUNCS([sched_getparam sched_setscheduler])
 
 dnl ******************************
 dnl *** Check for i18n support ***
diff --git a/tumblerd/tumbler-scheduler.c b/tumblerd/tumbler-scheduler.c
index c0ea82d..3148797 100644
--- a/tumblerd/tumbler-scheduler.c
+++ b/tumblerd/tumbler-scheduler.c
@@ -349,7 +349,7 @@ tumbler_scheduler_thread_use_lower_priority (void)
 
   ioprio_set (IOPRIO_WHO_PROCESS, 0, ioprio | ioclass);
 
-#ifdef HAVE_SCHED_H
+#if defined (HAVE_sched_getparam) && defined (HAVE_sched_setscheduler)
   if (sched_getparam (0, &sp) == 0) 
     sched_setscheduler (0, SCHED_IDLE, &sp);
 #endif