Index: head/usr.bin/top/machine.c
===================================================================
--- head/usr.bin/top/machine.c
+++ head/usr.bin/top/machine.c
@@ -328,14 +328,15 @@
 	    size != sizeof(smpmode))
 		smpmode = 0;
 
-	size = sizeof(carc_en);
-	if (sysctlbyname("vfs.zfs.compressed_arc_enabled", &carc_en, &size,
-	    NULL, 0) == 0 && carc_en == 1)
-		carc_enabled = 1;
 	size = sizeof(arc_size);
 	if (sysctlbyname("kstat.zfs.misc.arcstats.size", &arc_size, &size,
 	    NULL, 0) == 0 && arc_size != 0)
 		arc_enabled = 1;
+	size = sizeof(carc_en);
+	if (arc_enabled &&
+	    sysctlbyname("vfs.zfs.compressed_arc_enabled", &carc_en, &size,
+	    NULL, 0) == 0 && carc_en == 1)
+		carc_enabled = 1;
 
 	if (do_unames) {
 	    while ((pw = getpwent()) != NULL) {