diff --git a/include/common/compat.h b/include/common/compat.h
index 9b97d82..088b2c9 100644
--- a/include/common/compat.h
+++ b/include/common/compat.h
@@ -105,7 +105,7 @@
 #endif
 
 /* systems without such defines do not know clockid_t or timer_t */
-#if !(_POSIX_TIMERS > 0) || (_POSIX_C_SOURCE < 199309L)
+#if !(_POSIX_TIMERS > 0)
 #undef clockid_t
 #define clockid_t empty_t
 #undef timer_t
diff --git a/src/wdt.c b/src/wdt.c
index 10b7e5e..45438d6 100644
--- a/src/wdt.c
+++ b/src/wdt.c
@@ -25,7 +25,7 @@
  * It relies on timer_create() and timer_settime() which are only available in
  * this case.
  */
-#if defined(USE_THREAD) && (_POSIX_TIMERS > 0) && defined(_POSIX_THREAD_CPUTIME) && (_POSIX_C_SOURCE >= 199309L)
+#if defined(USE_THREAD) && (_POSIX_TIMERS > 0) && defined(_POSIX_THREAD_CPUTIME)
 
 /* We'll deliver SIGALRM when we've run out of CPU as it's not intercepted by
  * gdb by default.