diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index 93d3045c8..14203fb03 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -23,6 +23,9 @@ fixed in this release:</p>
   <a href="https://launchpad.net/bugs/907761">
     reading only 1st char of link in "long string" ($) syntax fails in read
     error</a></li>
+<li>903448
+  <a href="https://launchpad.net/bugs/903448">
+    RHEL5 nss ldap update cause stack size related failure</a></li>
 </ul>
 
 <h4>Comments in iocsh scripts</h4>
diff --git a/src/libCom/osi/os/WIN32/osdThread.c b/src/libCom/osi/os/WIN32/osdThread.c
index c880fbd1a..86f7b7df7 100644
--- a/src/libCom/osi/os/WIN32/osdThread.c
+++ b/src/libCom/osi/os/WIN32/osdThread.c
@@ -446,7 +446,10 @@ epicsShareFunc epicsThreadBooleanStatus epicsShareAPI epicsThreadHighestPriority
 epicsShareFunc unsigned int epicsShareAPI 
     epicsThreadGetStackSize ( epicsThreadStackSizeClass stackSizeClass ) 
 {
-    static const unsigned stackSizeTable[epicsThreadStackBig+1] = {4000, 6000, 11000};
+    #define STACK_SIZE(f) (f * 0x10000 * sizeof(void *))
+    static const unsigned stackSizeTable[epicsThreadStackBig+1] = {
+        STACK_SIZE(1), STACK_SIZE(2), STACK_SIZE(4)
+    };
 
     if (stackSizeClass<epicsThreadStackSmall) {
         fprintf ( stderr,
diff --git a/src/libCom/osi/os/posix/osdThread.c b/src/libCom/osi/os/posix/osdThread.c
index f7e47b100..3755d943a 100644
--- a/src/libCom/osi/os/posix/osdThread.c
+++ b/src/libCom/osi/os/posix/osdThread.c
@@ -398,9 +398,6 @@ static void epicsThreadInit(void)
 }
 
 
-#define ARCH_STACK_FACTOR 1024
-
-
 epicsShareFunc unsigned int epicsShareAPI epicsThreadGetStackSize (epicsThreadStackSizeClass stackSizeClass)
 {
 #if ! defined (_POSIX_THREAD_ATTR_STACKSIZE)
@@ -408,8 +405,10 @@ epicsShareFunc unsigned int epicsShareAPI epicsThreadGetStackSize (epicsThreadSt
 #elif defined (OSITHREAD_USE_DEFAULT_STACK)
     return 0;
 #else
-    static const unsigned stackSizeTable[epicsThreadStackBig+1] =
-        {128*ARCH_STACK_FACTOR, 256*ARCH_STACK_FACTOR, 512*ARCH_STACK_FACTOR};
+    #define STACK_SIZE(f) (f * 0x10000 * sizeof(void *))
+    static const unsigned stackSizeTable[epicsThreadStackBig+1] = {
+        STACK_SIZE(1), STACK_SIZE(2), STACK_SIZE(4)
+    };
     if (stackSizeClass<epicsThreadStackSmall) {
         errlogPrintf("epicsThreadGetStackSize illegal argument (too small)");
         return stackSizeTable[epicsThreadStackBig];