diff --git a/Makefile b/Makefile
index fa67d76..d9a4029 100644
--- a/Makefile
+++ b/Makefile
@@ -722,6 +722,7 @@
 TEST_BUILTINS_OBJS += test-mktemp.o
 TEST_BUILTINS_OBJS += test-online-cpus.o
 TEST_BUILTINS_OBJS += test-path-utils.o
+TEST_BUILTINS_OBJS += test-pkt-line.o
 TEST_BUILTINS_OBJS += test-prio-queue.o
 TEST_BUILTINS_OBJS += test-read-cache.o
 TEST_BUILTINS_OBJS += test-ref-store.o
@@ -745,7 +746,6 @@
 TEST_PROGRAMS_NEED_X += test-fake-ssh
 TEST_PROGRAMS_NEED_X += test-line-buffer
 TEST_PROGRAMS_NEED_X += test-parse-options
-TEST_PROGRAMS_NEED_X += test-pkt-line
 TEST_PROGRAMS_NEED_X += test-svn-fe
 TEST_PROGRAMS_NEED_X += test-tool
 
diff --git a/t/helper/test-pkt-line.c b/t/helper/test-pkt-line.c
index 30775f9..282d536 100644
--- a/t/helper/test-pkt-line.c
+++ b/t/helper/test-pkt-line.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "test-tool.h"
 #include "pkt-line.h"
 
 static void pack_line(const char *line)
@@ -79,7 +80,7 @@ static void unpack_sideband(void)
 	}
 }
 
-int cmd_main(int argc, const char **argv)
+int cmd__pkt_line(int argc, const char **argv)
 {
 	if (argc < 2)
 		die("too few arguments");
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 8203357..0ef5315 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -27,6 +27,7 @@ static struct test_cmd cmds[] = {
 	{ "mktemp", cmd__mktemp },
 	{ "online-cpus", cmd__online_cpus },
 	{ "path-utils", cmd__path_utils },
+	{ "pkt-line", cmd__pkt_line },
 	{ "prio-queue", cmd__prio_queue },
 	{ "read-cache", cmd__read_cache },
 	{ "ref-store", cmd__ref_store },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index 118c700..7a0ac22 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -23,6 +23,7 @@ int cmd__mergesort(int argc, const char **argv);
 int cmd__mktemp(int argc, const char **argv);
 int cmd__online_cpus(int argc, const char **argv);
 int cmd__path_utils(int argc, const char **argv);
+int cmd__pkt_line(int argc, const char **argv);
 int cmd__prio_queue(int argc, const char **argv);
 int cmd__read_cache(int argc, const char **argv);
 int cmd__ref_store(int argc, const char **argv);
diff --git a/t/t5701-git-serve.sh b/t/t5701-git-serve.sh
index 75ec79e..29a54fb 100755
--- a/t/t5701-git-serve.sh
+++ b/t/t5701-git-serve.sh
@@ -15,13 +15,13 @@
 	EOF
 
 	git serve --advertise-capabilities >out &&
-	test-pkt-line unpack <out >actual &&
+	test-tool pkt-line unpack <out >actual &&
 	test_cmp actual expect
 '
 
 test_expect_success 'stateless-rpc flag does not list capabilities' '
 	# Empty request
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	0000
 	EOF
 	git serve --stateless-rpc >out <in &&
@@ -33,7 +33,7 @@
 '
 
 test_expect_success 'request invalid capability' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	foobar
 	0000
 	EOF
@@ -42,7 +42,7 @@
 '
 
 test_expect_success 'request with no command' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	agent=git/test
 	0000
 	EOF
@@ -51,7 +51,7 @@
 '
 
 test_expect_success 'request invalid command' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=foo
 	agent=git/test
 	0000
@@ -71,7 +71,7 @@
 '
 
 test_expect_success 'basics of ls-refs' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
 	0000
 	EOF
@@ -88,12 +88,12 @@
 	EOF
 
 	git serve --stateless-rpc <in >out &&
-	test-pkt-line unpack <out >actual &&
+	test-tool pkt-line unpack <out >actual &&
 	test_cmp actual expect
 '
 
 test_expect_success 'basic ref-prefixes' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
 	0001
 	ref-prefix refs/heads/master
@@ -108,12 +108,12 @@
 	EOF
 
 	git serve --stateless-rpc <in >out &&
-	test-pkt-line unpack <out >actual &&
+	test-tool pkt-line unpack <out >actual &&
 	test_cmp actual expect
 '
 
 test_expect_success 'refs/heads prefix' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
 	0001
 	ref-prefix refs/heads/
@@ -128,12 +128,12 @@
 	EOF
 
 	git serve --stateless-rpc <in >out &&
-	test-pkt-line unpack <out >actual &&
+	test-tool pkt-line unpack <out >actual &&
 	test_cmp actual expect
 '
 
 test_expect_success 'peel parameter' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
 	0001
 	peel
@@ -149,12 +149,12 @@
 	EOF
 
 	git serve --stateless-rpc <in >out &&
-	test-pkt-line unpack <out >actual &&
+	test-tool pkt-line unpack <out >actual &&
 	test_cmp actual expect
 '
 
 test_expect_success 'symrefs parameter' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
 	0001
 	symrefs
@@ -170,12 +170,12 @@
 	EOF
 
 	git serve --stateless-rpc <in >out &&
-	test-pkt-line unpack <out >actual &&
+	test-tool pkt-line unpack <out >actual &&
 	test_cmp actual expect
 '
 
 test_expect_success 'sending server-options' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=ls-refs
 	server-option=hello
 	server-option=world
@@ -190,14 +190,14 @@
 	EOF
 
 	git serve --stateless-rpc <in >out &&
-	test-pkt-line unpack <out >actual &&
+	test-tool pkt-line unpack <out >actual &&
 	test_cmp actual expect
 '
 
 test_expect_success 'unexpected lines are not allowed in fetch request' '
 	git init server &&
 
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=fetch
 	0001
 	this-is-not-a-command
diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh
index 3beeed4..88a8869 100755
--- a/t/t5702-protocol-v2.sh
+++ b/t/t5702-protocol-v2.sh
@@ -334,7 +334,7 @@
 	git -C server config uploadpack.allowfilter 0 &&
 
 	# Custom request that tries to filter even though it is not advertised.
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=fetch
 	0001
 	want $(git -C server rev-parse master)
diff --git a/t/t5703-upload-pack-ref-in-want.sh b/t/t5703-upload-pack-ref-in-want.sh
index d1ccc22..3f58f05 100755
--- a/t/t5703-upload-pack-ref-in-want.sh
+++ b/t/t5703-upload-pack-ref-in-want.sh
@@ -9,14 +9,14 @@
 		/wanted-refs/d
 		/0001/d
 		p
-		}' <out | test-pkt-line unpack >actual_refs
+		}' <out | test-tool pkt-line unpack >actual_refs
 }
 
 get_actual_commits () {
 	sed -n -e '/packfile/,/0000/{
 		/packfile/d
 		p
-		}' <out | test-pkt-line unpack-sideband >o.pack &&
+		}' <out | test-tool pkt-line unpack-sideband >o.pack &&
 	git index-pack o.pack &&
 	git verify-pack -v o.idx | grep commit | cut -c-40 | sort >actual_commits
 }
@@ -61,7 +61,7 @@
 '
 
 test_expect_success 'invalid want-ref line' '
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=fetch
 	0001
 	no-progress
@@ -80,7 +80,7 @@
 	EOF
 	git rev-parse f | sort >expected_commits &&
 
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=fetch
 	0001
 	no-progress
@@ -101,7 +101,7 @@
 	EOF
 	git rev-parse c d | sort >expected_commits &&
 
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=fetch
 	0001
 	no-progress
@@ -122,7 +122,7 @@
 	EOF
 	git rev-parse e f | sort >expected_commits &&
 
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=fetch
 	0001
 	no-progress
@@ -143,7 +143,7 @@
 	EOF
 	>expected_commits &&
 
-	test-pkt-line pack >in <<-EOF &&
+	test-tool pkt-line pack >in <<-EOF &&
 	command=fetch
 	0001
 	no-progress