Index: /trunk/src/libs/xpcom18a4/nsprpub/pr/src/pthreads/ptthread.c
===================================================================
--- /trunk/src/libs/xpcom18a4/nsprpub/pr/src/pthreads/ptthread.c	(revision 15994)
+++ /trunk/src/libs/xpcom18a4/nsprpub/pr/src/pthreads/ptthread.c	(revision 15995)
@@ -398,5 +398,9 @@
 #endif /* !VBOX_USE_IPRT_IN_NSPR */
 
+#ifndef VBOX_USE_IPRT_IN_NSPR
     if (0 == stackSize) stackSize = (64 * 1024);  /* default == 64K */
+#else
+    if (0 == stackSize) stackSize = (2 * 64 * 1024);  /* default == 128K */
+#endif /* VBOX_USE_IPRT_IN_NSPR */
 #ifdef _MD_MINIMUM_STACK_SIZE
     if (stackSize < _MD_MINIMUM_STACK_SIZE) stackSize = _MD_MINIMUM_STACK_SIZE;