diff --git a/builtin-prune.c b/builtin-prune.c
index bb8ead92cf..71caac578d 100644
--- a/builtin-prune.c
+++ b/builtin-prune.c
@@ -4,8 +4,12 @@
 #include "revision.h"
 #include "builtin.h"
 #include "reachable.h"
+#include "parse-options.h"
 
-static const char prune_usage[] = "git-prune [-n]";
+static const char * const prune_usage[] = {
+	"git-prune [-n] [--expire <time>] [--] [<head>...]",
+	NULL
+};
 static int show_only;
 static unsigned long expire;
 
@@ -123,32 +127,22 @@ static void remove_temporary_files(void)
 
 int cmd_prune(int argc, const char **argv, const char *prefix)
 {
-	int i;
 	struct rev_info revs;
-
-	for (i = 1; i < argc; i++) {
-		const char *arg = argv[i];
-		if (!strcmp(arg, "-n")) {
-			show_only = 1;
-			continue;
-		}
-		if (!strcmp(arg, "--expire")) {
-			if (++i < argc) {
-				expire = approxidate(argv[i]);
-				continue;
-			}
-		}
-		else if (!prefixcmp(arg, "--expire=")) {
-			expire = approxidate(arg + 9);
-			continue;
-		}
-		usage(prune_usage);
-	}
+	const struct option options[] = {
+		OPT_BOOLEAN('n', NULL, &show_only,
+			    "do not remove, show only"),
+		OPT_DATE(0, "expire", &expire,
+			 "expire objects older than <time>"),
+		OPT_END()
+	};
 
 	save_commit_buffer = 0;
 	init_revisions(&revs, prefix);
-	mark_reachable_objects(&revs, 1);
 
+	argc = parse_options(argc, argv, options, prune_usage, 0);
+	if (argc)
+		die ("unrecognized argument: %s", name);
+	mark_reachable_objects(&revs, 1);
 	prune_object_dir(get_object_directory());
 
 	sync();
