diff --git a/testing/ostest/posixtimer.c b/testing/ostest/posixtimer.c
index 6c296f02c..9ae0a1f8d 100644
--- a/testing/ostest/posixtimer.c
+++ b/testing/ostest/posixtimer.c
@@ -38,8 +38,8 @@
  * Private Definitions
  ****************************************************************************/
 
-#define MY_TIMER_SIGNAL 17
-#define SIGVALUE_INT  42
+#define MY_TIMER_SIGNAL SIGRTMIN
+#define SIGVALUE_INT    42
 
 /****************************************************************************
  * Private Data
diff --git a/testing/ostest/sigev_thread.c b/testing/ostest/sigev_thread.c
index 1a598fab0..930379ea6 100644
--- a/testing/ostest/sigev_thread.c
+++ b/testing/ostest/sigev_thread.c
@@ -36,8 +36,8 @@
  * Private Definitions
  ****************************************************************************/
 
-#define MY_TIMER_SIGNAL 17
-#define SIGVALUE_INT  42
+#define MY_TIMER_SIGNAL SIGRTMIN
+#define SIGVALUE_INT    42
 
 /****************************************************************************
  * Private Data
diff --git a/testing/ostest/sighand.c b/testing/ostest/sighand.c
index 128b9dfb4..de29355ef 100644
--- a/testing/ostest/sighand.c
+++ b/testing/ostest/sighand.c
@@ -43,7 +43,7 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#define WAKEUP_SIGNAL 17
+#define WAKEUP_SIGNAL SIGRTMIN
 #define SIGVALUE_INT  42
 
 /****************************************************************************
diff --git a/testing/ostest/signest.c b/testing/ostest/signest.c
index 85b32f5a5..8b4080f7c 100644
--- a/testing/ostest/signest.c
+++ b/testing/ostest/signest.c
@@ -41,7 +41,7 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#define WAKEUP_SIGNAL 17
+#define WAKEUP_SIGNAL SIGRTMIN
 #define SIGVALUE_INT  42
 
 /****************************************************************************