diff --git a/ChangeLog b/ChangeLog
index af7618323..80bfabeb9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2012-07-09  Sebastian Reitenbach <buzzdee>
+
+        * Source/NSThread.m: Fixes test for posix thread scheduling.
+
 2012-07-09  Richard Frith-Macdonald <rfm@gnu.org>
 
         * Source/NSBundle.m: Fixes for bug #34815 ... map between old and
diff --git a/Source/NSThread.m b/Source/NSThread.m
index 9118c1335..4566da976 100644
--- a/Source/NSThread.m
+++ b/Source/NSThread.m
@@ -578,7 +578,7 @@ unregisterActiveThread(NSThread *thread)
  */
 + (void) setThreadPriority: (double)pri
 {
-#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+#if defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING > 0)
   int	policy;
   struct sched_param param;
 
@@ -616,7 +616,7 @@ unregisterActiveThread(NSThread *thread)
 + (double) threadPriority
 {
   double pri = 0;
-#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+#if defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING > 0)
   int policy;
   struct sched_param param;