diff --git a/camlibs/ptp2/ptp-pack.c b/camlibs/ptp2/ptp-pack.c
index f4d1b14de..6aeffef4f 100644
--- a/camlibs/ptp2/ptp-pack.c
+++ b/camlibs/ptp2/ptp-pack.c
@@ -1537,7 +1537,7 @@ ptp_unpack_CANON_changes (PTPParams *params, unsigned char* data, int datasize,
 			(*ce)[i].u.object.oi.ObjectCompressedSize = dtoh32a(&curdata[PTP_ece_OI_Size]);
 			(*ce)[i].u.object.oi.Filename 		= strdup(((char*)&curdata[PTP_ece_OI_Name]));
 
-			ptp_debug (params, "event %d: request object transfer oid %08lx, ofc %04x, size %d, filename %s", i, (*ce)[i].u.object.oid, (*ce)[i].u.object.oi.ObjectFormat, (*ce)[i].u.object.oi.ObjectCompressedSize, (*ce)[i].u.object.oi.Filename);
+			ptp_debug (params, "event %d: request object transfer oid %08lx, ofc %04x, size %d, filename %p", i, (*ce)[i].u.object.oid, (*ce)[i].u.object.oi.ObjectFormat, (*ce)[i].u.object.oi.ObjectCompressedSize, (*ce)[i].u.object.oi.Filename);
 			break;
 		case  PTP_EC_CANON_EOS_AvailListChanged: {	/* property desc */
 			uint32_t	proptype = dtoh32a(&curdata[PTP_ece_Prop_Subtype]);