Index: kernel/arch/sparc64/src/sparc64.c
===================================================================
--- kernel/arch/sparc64/src/sparc64.c	(revision 586cd564257e1db0066856695738f5c081b52050)
+++ kernel/arch/sparc64/src/sparc64.c	(revision 37341067b82a963f35d71fa0b343a8b8f7105236)
@@ -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