Index: src/tests/concurrent/signal/barge.c
===================================================================
--- src/tests/concurrent/signal/barge.c	(revision 94ddedef7d98692818b37f356a5085b68c4e662f)
+++ src/tests/concurrent/signal/barge.c	(revision ca374456181d2f3ca0a61f3c111e0b915fa01059)
@@ -16,8 +16,8 @@
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10_000ul
+#define PREEMPTION_RATE 10`ms
 #endif
 
-unsigned int default_preemption() {
+Duration default_preemption() {
 	return 0;
 }
Index: src/tests/concurrent/signal/block.c
===================================================================
--- src/tests/concurrent/signal/block.c	(revision 94ddedef7d98692818b37f356a5085b68c4e662f)
+++ src/tests/concurrent/signal/block.c	(revision ca374456181d2f3ca0a61f3c111e0b915fa01059)
@@ -22,8 +22,8 @@
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10_000ul
+#define PREEMPTION_RATE 10`ms
 #endif
 
-unsigned int default_preemption() {
+Duration default_preemption() {
 	return PREEMPTION_RATE;
 }
Index: src/tests/concurrent/signal/disjoint.c
===================================================================
--- src/tests/concurrent/signal/disjoint.c	(revision 94ddedef7d98692818b37f356a5085b68c4e662f)
+++ src/tests/concurrent/signal/disjoint.c	(revision ca374456181d2f3ca0a61f3c111e0b915fa01059)
@@ -13,8 +13,8 @@
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10_000ul
+#define PREEMPTION_RATE 10`ms
 #endif
 
-unsigned int default_preemption() {
+Duration default_preemption() {
 	return PREEMPTION_RATE;
 }
Index: src/tests/concurrent/signal/wait.c
===================================================================
--- src/tests/concurrent/signal/wait.c	(revision 94ddedef7d98692818b37f356a5085b68c4e662f)
+++ src/tests/concurrent/signal/wait.c	(revision ca374456181d2f3ca0a61f3c111e0b915fa01059)
@@ -20,8 +20,8 @@
 
 #ifndef PREEMPTION_RATE
-#define PREEMPTION_RATE 10_000ul
+#define PREEMPTION_RATE 10`ms
 #endif
 
-unsigned int default_preemption() {
+Duration default_preemption() {
 	return PREEMPTION_RATE;
 }