Index: kernel/arch/sparc64/src/sparc64.c
===================================================================
--- kernel/arch/sparc64/src/sparc64.c	(revision 19490cea4251de33ed19741087be0c03ff4d2a4f)
+++ kernel/arch/sparc64/src/sparc64.c	(revision 057d21af95b6d9e801a14c4a6e6e4a784ad3dfd7)
@@ -135,4 +135,5 @@
 void userspace(uspace_arg_t *kernel_uarg)
 {
+	(void) interrupts_disable();
 	switch_to_userspace((uintptr_t) kernel_uarg->uspace_entry,
 	    ((uintptr_t) kernel_uarg->uspace_stack) + STACK_SIZE