Index: src/tests/concurrent/waitfor/simple.c
===================================================================
--- src/tests/concurrent/waitfor/simple.c	(revision 54aba8dc2740ad848ff31060ce9311cb75d5f7b2)
+++ src/tests/concurrent/waitfor/simple.c	(revision 43c6fe7754328f68f45ca7e7c1e7c6820b3b6867)
@@ -10,8 +10,8 @@
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10_000ul
+#define PREEMPTION_RATE 10`ms
 #endif
 
-unsigned int default_preemption() {
+Duration default_preemption() {
 	return PREEMPTION_RATE;
 }