diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 98d1cbeccacc4b22dee88dab3d0154a3f70afe81..733f626f6c3e4ef54d54df923230f7ae4fbb2d7d 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -634,6 +634,8 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 			if (!strcmp(arg, "--show-prefix")) {
 				if (prefix)
 					puts(prefix);
+				else
+					putchar('\n');
 				continue;
 			}
 			if (!strcmp(arg, "--show-cdup")) {
diff --git a/t/t1501-worktree.sh b/t/t1501-worktree.sh
index e661147c573fa7312e8f533a4a4c8ea1eda7763f..8f36aa9fc4d2bdd8b590e3241eccf88609db4ee2 100755
--- a/t/t1501-worktree.sh
+++ b/t/t1501-worktree.sh
@@ -68,7 +68,7 @@ test_expect_success 'inside work tree' '
 	)
 '
 
-test_expect_failure 'empty prefix is actually written out' '
+test_expect_success 'empty prefix is actually written out' '
 	echo >expected &&
 	(
 		cd work &&