Index: kernel/generic/src/lib/ra.c
===================================================================
--- kernel/generic/src/lib/ra.c	(revision 002fd5f375765c45f5e59bbc374e1418520abddf)
+++ kernel/generic/src/lib/ra.c	(revision 673ea280ee37bd8659e792ffafa7c333112361a5)
@@ -353,6 +353,6 @@
 	link = hash_table_find(&span->used, &key);
 	if (!link) {
-		panic("Freeing segment which is not known to be used (base=%"
-		    PRIxn ", size=%" PRIdn ").", base, size);
+		panic("Freeing segment which is not known to be used (base=%zx"
+		    ", size=%zd).", base, size);
 	}
 	seg = hash_table_get_inst(link, ra_segment_t, uh_link);
@@ -447,5 +447,5 @@
 	irq_spinlock_unlock(&arena->lock, true);
 
-	panic("Freeing to wrong arena (base=%" PRIxn ", size=%" PRIdn ").",
+	panic("Freeing to wrong arena (base=%" PRIxPTR ", size=%zd).",
 	    base, size);
 }