diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index 3ee918695215791b10f01ca19e9095b094cf35f5..f85b928ffac418080315ac0e6aa19038f388ae24 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -335,7 +335,7 @@ void dump_thread(struct pt_regs * regs, struct user * dump)
 	if (dump->start_stack < TASK_SIZE)
 		dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
 
-	dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
+	dump->u_ar0 = offsetof(struct user, regs);
 	sw = ((struct switch_stack *)regs) - 1;
 	dump->regs.d1 = regs->d1;
 	dump->regs.d2 = regs->d2;