diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
index baa9036..e2af5eb 100644
--- a/arch/alpha/kernel/ptrace.c
+++ b/arch/alpha/kernel/ptrace.c
@@ -269,7 +269,8 @@
 	user_disable_single_step(child);
 }
 
-long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+long arch_ptrace(struct task_struct *child, long request,
+		 unsigned long addr, unsigned long data)
 {
 	unsigned long tmp;
 	size_t copied;
@@ -292,7 +293,7 @@
 	case PTRACE_PEEKUSR:
 		force_successful_syscall_return();
 		ret = get_reg(child, addr);
-		DBG(DBG_MEM, ("peek $%ld->%#lx\n", addr, ret));
+		DBG(DBG_MEM, ("peek $%lu->%#lx\n", addr, ret));
 		break;
 
 	/* When I and D space are separate, this will have to be fixed.  */
@@ -302,7 +303,7 @@
 		break;
 
 	case PTRACE_POKEUSR: /* write the specified register */
-		DBG(DBG_MEM, ("poke $%ld<-%#lx\n", addr, data));
+		DBG(DBG_MEM, ("poke $%lu<-%#lx\n", addr, data));
 		ret = put_reg(child, addr, data);
 		break;
 	default: