diff --git a/cpukit/ChangeLog b/cpukit/ChangeLog
index 962dcdd6f5..c961412d5b 100644
--- a/cpukit/ChangeLog
+++ b/cpukit/ChangeLog
@@ -1,3 +1,9 @@
+2011-08-02	Jennifer.Averett <Jennifer.Averett@OARcorp.com>
+
+	PR 1872
+	* score/src/apimutexlock.c, score/src/apimutexunlock.c: Added smp
+	support to apimutex.
+
 2011-08-02	Petr Benes <benesp16@fel.cvut.cz>
 
 	PR 1861/cpukit
diff --git a/cpukit/score/src/apimutexlock.c b/cpukit/score/src/apimutexlock.c
index 6729478ae4..b8e74064a2 100644
--- a/cpukit/score/src/apimutexlock.c
+++ b/cpukit/score/src/apimutexlock.c
@@ -22,6 +22,10 @@ void _API_Mutex_Lock(
 {
   ISR_Level level;
 
+  #if defined(RTEMS_SMP)
+    _Thread_Disable_dispatch();
+  #endif
+
   _ISR_Disable( level );
 
   _CORE_mutex_Seize(
diff --git a/cpukit/score/src/apimutexunlock.c b/cpukit/score/src/apimutexunlock.c
index ca824a6e6c..7ebfb90946 100644
--- a/cpukit/score/src/apimutexunlock.c
+++ b/cpukit/score/src/apimutexunlock.c
@@ -20,7 +20,10 @@ void _API_Mutex_Unlock(
   API_Mutex_Control *the_mutex
 )
 {
-  _Thread_Disable_dispatch();
+   /* Dispatch is already disabled in SMP while lock is held. */
+   #if !defined(RTEMS_SMP)
+     _Thread_Disable_dispatch();
+   #endif
     _CORE_mutex_Surrender(
       &the_mutex->Mutex,
       the_mutex->Object.id,