Index: src/tests/preempt_longrun/yield.c
===================================================================
--- src/tests/preempt_longrun/yield.c	(revision 8ad653339f39e704e4be3cbd354de857c44a52f4)
+++ src/tests/preempt_longrun/yield.c	(revision 1ed958c38e6aaf12525b373df228b8bdfe25d2fb)
@@ -1,4 +1,13 @@
 #include <kernel>
 #include <thread>
+#include <time>
+
+#ifndef PREEMPTION_RATE
+#error PREEMPTION_RATE not defined in makefile
+#endif
+
+Duration default_preemption() {
+	return PREEMPTION_RATE;
+}
 
 #ifdef LONG_TEST
@@ -7,12 +16,4 @@
 static const unsigned long N = 325_000ul;
 #endif
-
-#ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10`ms
-#endif
-
-Duration default_preemption() {
-	return PREEMPTION_RATE;
-}
 
 thread worker_t {};