diff --git a/configs/open1788/kernel/up_userspace.c b/configs/open1788/kernel/up_userspace.c
index e2cb8c0132c..3947af1cdad 100644
--- a/configs/open1788/kernel/up_userspace.c
+++ b/configs/open1788/kernel/up_userspace.c
@@ -105,6 +105,9 @@ const struct userspace_s userspace __attribute__ ((section (".userspace"))) =
   /* Task/thread startup stubs */
 
   .task_startup     = task_startup,
+#ifndef CONFIG_DISABLE_PTHREAD
+  .pthread_startup  = pthread_startup,
+#endif
 
   /* Memory manager entry points (declared in include/nuttx/mm.h) */
 
diff --git a/configs/open1788/knsh/defconfig b/configs/open1788/knsh/defconfig
index 50b4e3d6d7e..b8d36e6fd2a 100755
--- a/configs/open1788/knsh/defconfig
+++ b/configs/open1788/knsh/defconfig
@@ -344,7 +344,7 @@ CONFIG_IDLETHREAD_STACKSIZE=1024
 CONFIG_USERMAIN_STACKSIZE=2048
 CONFIG_PTHREAD_STACK_MIN=256
 CONFIG_PTHREAD_STACK_DEFAULT=2048
-CONFIG_SYS_RESERVED=5
+CONFIG_SYS_RESERVED=6
 
 #
 # Device Drivers
diff --git a/configs/sam3u-ek/kernel/up_userspace.c b/configs/sam3u-ek/kernel/up_userspace.c
index e148b135cb6..ee61d1b692b 100644
--- a/configs/sam3u-ek/kernel/up_userspace.c
+++ b/configs/sam3u-ek/kernel/up_userspace.c
@@ -101,6 +101,13 @@ const struct userspace_s userspace __attribute__ ((section (".userspace"))) =
   .us_bssstart      = (uintptr_t)&_sbss,
   .us_bssend        = (uintptr_t)&_ebss,
 
+  /* Task/thread startup stubs */
+
+  .task_startup     = task_startup,
+#ifndef CONFIG_DISABLE_PTHREAD
+  .pthread_startup  = pthread_startup,
+#endif
+
   /* Memory manager entry points (declared in include/nuttx/mm.h) */
 
   .mm_initialize    = umm_initialize,
diff --git a/configs/sam3u-ek/knsh/defconfig b/configs/sam3u-ek/knsh/defconfig
index 7146ef6bf3d..9bdb33004a8 100755
--- a/configs/sam3u-ek/knsh/defconfig
+++ b/configs/sam3u-ek/knsh/defconfig
@@ -249,7 +249,7 @@ CONFIG_IDLETHREAD_STACKSIZE=1024
 CONFIG_USERMAIN_STACKSIZE=2048
 CONFIG_PTHREAD_STACK_MIN=256
 CONFIG_PTHREAD_STACK_DEFAULT=2048
-CONFIG_SYS_RESERVED=5
+CONFIG_SYS_RESERVED=6
 
 #
 # Device Drivers