diff --git a/ChangeLog b/ChangeLog
index 19eadab4b..e275cfe79 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2006-03-17  Andrew Sveikauskas <asveikau@mail.rochester.edu>
+
+	* Source/thr-mach.h: include objc/objc-api.h
+	* Source/thr-pthread.m: use pthread_yield() except for apple
+
 2006-03-13  Adam Fedor  <fedor@gnu.org>
 
 	* Version 1.12.0
diff --git a/Source/thr-mach.h b/Source/thr-mach.h
index 917f08b98..3f0eb8ae3 100644
--- a/Source/thr-mach.h
+++ b/Source/thr-mach.h
@@ -39,6 +39,7 @@ Boston, MA 02110-1301, USA.  */
 #define __thread_INCLUDE_GNU
 
 #include <objc/objc.h>
+#include <objc/objc-api.h>
 
 /*************************************************************************
  *  Universal static variables:
diff --git a/Source/thr-pthread.m b/Source/thr-pthread.m
index 31f9117c9..84c5cfd42 100644
--- a/Source/thr-pthread.m
+++ b/Source/thr-pthread.m
@@ -238,9 +238,9 @@ objc_thread_get_priority(void)
 void
 objc_thread_yield(void)
 {
-#if 0
+#if !defined(__APPLE__)
   /* Not defined in darwin? */
-  pthread_yield(NULL);
+  pthread_yield();
 #else
   sched_yield();
 #endif