diff --git a/target/linux/generic-2.6/patches-2.6.30/980-vm_exports.patch b/target/linux/generic-2.6/patches-2.6.30/980-vm_exports.patch
index aaecec06a3..aad8f813d8 100644
--- a/target/linux/generic-2.6/patches-2.6.30/980-vm_exports.patch
+++ b/target/linux/generic-2.6/patches-2.6.30/980-vm_exports.patch
@@ -124,3 +124,13 @@
  int shmem_zero_setup(struct vm_area_struct *);
  
  #ifndef CONFIG_MMU
+--- a/kernel/signal.c
++++ b/kernel/signal.c
+@@ -1053,6 +1053,7 @@ struct sighand_struct *lock_task_sighand
+ 
+ 	return sighand;
+ }
++EXPORT_SYMBOL(lock_task_sighand);
+ 
+ /*
+  * send signal info to all the members of a group