diff --git a/src/rx/rx.c b/src/rx/rx.c
index 19cf09c3ec..def5febb81 100755
--- a/src/rx/rx.c
+++ b/src/rx/rx.c
@@ -800,8 +800,10 @@ rx_NewConnection(afs_uint32 shost, u_short sport, u_short sservice,
     SPLVAR;
 
     clock_NewTime();
-    dpf(("rx_NewConnection(host %x, port %u, service %u, securityObject %x, serviceSecurityIndex %d)\n",
-          ntohl(shost), ntohs(sport), sservice, securityObject, serviceSecurityIndex));
+    dpf(("rx_NewConnection(host %x, port %u, service %u, securityObject %p, "
+	 "serviceSecurityIndex %d)\n",
+         ntohl(shost), ntohs(sport), sservice, securityObject,
+	 serviceSecurityIndex));
 
     /* Vasilsi said: "NETPRI protects Cid and Alloc", but can this be true in
      * the case of kmem_alloc? */
@@ -1741,7 +1743,7 @@ rx_GetCall(int tno, struct rx_service *cur_service, osi_socket * socketp)
 	CALL_HOLD(call, RX_CALL_REFCOUNT_BEGIN);
 	MUTEX_EXIT(&call->lock);
     } else {
-	dpf(("rx_GetCall(socketp=0x%"AFS_PTR_FMT", *socketp=0x%"AFS_PTR_FMT")\n", socketp, *socketp));
+	dpf(("rx_GetCall(socketp=%p, *socketp=0x%x)\n", socketp, *socketp));
     }
 
     return call;
@@ -1888,11 +1890,11 @@ rx_GetCall(int tno, struct rx_service *cur_service, osi_socket * socketp)
 #endif
 
 	rxi_calltrace(RX_CALL_START, call);
-	dpf(("rx_GetCall(port=%d, service=%d) ==> call %x\n",
+	dpf(("rx_GetCall(port=%d, service=%d) ==> call %p\n",
 	     call->conn->service->servicePort, call->conn->service->serviceId,
 	     call));
     } else {
-	dpf(("rx_GetCall(socketp=0x%"AFS_PTR_FMT", *socketp=0x%"AFS_PTR_FMT")\n", socketp, *socketp));
+	dpf(("rx_GetCall(socketp=%p, *socketp=0x%x)\n", socketp, *socketp));
     }
 
     USERPRI;
@@ -2776,7 +2778,7 @@ rxi_ReceivePacket(struct rx_packet *np, osi_socket socket,
 	    *call->callNumber = np->header.callNumber;
 #ifdef RXDEBUG
 	    if (np->header.callNumber == 0) 
-		dpf(("RecPacket call 0 %d %s: %x.%u.%u.%u.%u.%u.%u flags %d, packet %"AFS_PTR_FMT" resend %d.%0.06d len %d",
+		dpf(("RecPacket call 0 %d %s: %x.%u.%u.%u.%u.%u.%u flags %d, packet %"AFS_PTR_FMT" resend %d.%.06d len %d",
                       np->header.serial, rx_packetTypes[np->header.type - 1], ntohl(conn->peer->host), ntohs(conn->peer->port),
                       np->header.serial, np->header.epoch, np->header.cid, np->header.callNumber, np->header.seq,
                       np->header.flags, np, np->retryTime.sec, np->retryTime.usec / 1000, np->length));
@@ -5509,8 +5511,8 @@ rxi_Start(struct rxevent *event,
                         rx_MutexIncrement(rx_tq_debug.rxi_start_aborted, rx_stats_mutex);
 		    call->flags &= ~RX_CALL_TQ_BUSY;
 		    if (call->tqWaiters || (call->flags & RX_CALL_TQ_WAIT)) {
-			dpf(("call error %d while xmit %x has %d waiters and flags %d\n",
-                             call, call->error, call->tqWaiters, call->flags));
+			dpf(("call error %d while xmit %p has %d waiters and flags %d\n",
+                             call->error, call, call->tqWaiters, call->flags));
 #ifdef RX_ENABLE_LOCKS
 			osirx_AssertMine(&call->lock, "rxi_Start middle");
 			CV_BROADCAST(&call->cv_tq);
diff --git a/src/rx/rx_packet.c b/src/rx/rx_packet.c
index c78fd1544b..dcba851910 100644
--- a/src/rx/rx_packet.c
+++ b/src/rx/rx_packet.c
@@ -2309,7 +2309,7 @@ rxi_SendPacket(struct rx_call *call, struct rx_connection *conn,
 #endif
 #ifdef RXDEBUG
     }
-    dpf(("%c %d %s: %x.%u.%u.%u.%u.%u.%u flags %d, packet %"AFS_PTR_FMT" resend %d.%0.3d len %d",
+    dpf(("%c %d %s: %x.%u.%u.%u.%u.%u.%u flags %d, packet %"AFS_PTR_FMT" resend %d.%.3d len %d",
           deliveryType, p->header.serial, rx_packetTypes[p->header.type - 1], ntohl(peer->host),
           ntohs(peer->port), p->header.serial, p->header.epoch, p->header.cid, p->header.callNumber,
           p->header.seq, p->header.flags, p, p->retryTime.sec, p->retryTime.usec / 1000, p->length));
@@ -2495,7 +2495,7 @@ rxi_SendPacketList(struct rx_call *call, struct rx_connection *conn,
 
     assert(p != NULL);
 
-    dpf(("%c %d %s: %x.%u.%u.%u.%u.%u.%u flags %d, packet %"AFS_PTR_FMT" resend %d.%0.3d len %d",
+    dpf(("%c %d %s: %x.%u.%u.%u.%u.%u.%u flags %d, packet %"AFS_PTR_FMT" resend %d.%.3d len %d",
           deliveryType, p->header.serial, rx_packetTypes[p->header.type - 1], ntohl(peer->host),
           ntohs(peer->port), p->header.serial, p->header.epoch, p->header.cid, p->header.callNumber,
           p->header.seq, p->header.flags, p, p->retryTime.sec, p->retryTime.usec / 1000, p->length));
diff --git a/src/rx/rx_prototypes.h b/src/rx/rx_prototypes.h
index c0a45390e5..84ce66eccc 100644
--- a/src/rx/rx_prototypes.h
+++ b/src/rx/rx_prototypes.h
@@ -268,7 +268,8 @@ extern afs_int32 rx_SetSecurityConfiguration(struct rx_service *service,
 					     void *value);
 
 void rxi_DebugInit(void);
-void rxi_DebugPrint(char *format, ...);
+void rxi_DebugPrint(char *format, ...)
+    AFS_ATTRIBUTE_FORMAT(__printf__, 1, 2);
 
 /* rx_clock.c */
 #if !defined(clock_Init)
@@ -378,8 +379,9 @@ extern void osi_Panic(char *fmt, void *a1, void *a2, void *a3);
 # elif defined(AFS_AIX61_ENV)
 /* No prototype. Deliberate, since there's no vprintf et al */
 # else
-extern void osi_Panic(char *fmt, ...);
-# endif
+extern void osi_Panic(char *fmt, ...)
+    AFS_ATTRIBUTE_FORMAT(__printf__, 1, 2);
+#endif
 extern int osi_utoa(char *buf, size_t len, unsigned long val);
 extern void rxi_InitPeerParams(struct rx_peer *pp);
 extern void shutdown_rxkernel(void);