Index: head/usr.bin/units/units.c
===================================================================
--- head/usr.bin/units/units.c
+++ head/usr.bin/units/units.c
@@ -802,10 +802,10 @@
 	if (!readfile)
 		readunits(NULL);
 
-	if (cap_enter() < 0 && errno != ENOSYS)
-		err(1, "unable to enter capability mode");
-
 	if (optind == argc - 2) {
+		if (cap_enter() < 0 && errno != ENOSYS)
+			err(1, "unable to enter capability mode");
+
 		havestr = argv[optind];
 		wantstr = argv[optind + 1];
 		initializeunit(&have);
@@ -815,8 +815,7 @@
 		addunit(&want, wantstr, 0, 1);
 		completereduce(&want);
 		showanswer(&have, &want);
-	}
-	else {
+	} else {
 		inhistory = history_init();
 		el = el_init(argv[0], stdin, stdout, stderr);
 		el_set(el, EL_PROMPT, &prompt);
@@ -828,6 +827,9 @@
 		if (inhistory == 0)
 			err(1, "Could not initialize history");
 
+		if (cap_enter() < 0 && errno != ENOSYS)
+			err(1, "unable to enter capability mode");
+
 		if (!quiet)
 			printf("%d units, %d prefixes\n", unitcount,
 			    prefixcount);