diff --git a/Makefile b/Makefile
index d0bc6cfecf..f6c3ddc703 100644
--- a/Makefile
+++ b/Makefile
@@ -662,13 +662,13 @@ TEST_BUILTINS_OBJS += test-dump-cache-tree.o
 TEST_BUILTINS_OBJS += test-dump-split-index.o
 TEST_BUILTINS_OBJS += test-example-decorate.o
 TEST_BUILTINS_OBJS += test-genrandom.o
+TEST_BUILTINS_OBJS += test-hashmap.o
 TEST_BUILTINS_OBJS += test-lazy-init-name-hash.o
 TEST_BUILTINS_OBJS += test-sha1.o
 
 TEST_PROGRAMS_NEED_X += test-dump-fsmonitor
 TEST_PROGRAMS_NEED_X += test-dump-untracked-cache
 TEST_PROGRAMS_NEED_X += test-fake-ssh
-TEST_PROGRAMS_NEED_X += test-hashmap
 TEST_PROGRAMS_NEED_X += test-index-version
 TEST_PROGRAMS_NEED_X += test-line-buffer
 TEST_PROGRAMS_NEED_X += test-match-trees
diff --git a/t/helper/test-hashmap.c b/t/helper/test-hashmap.c
index 9ae9281c07..23d2b172fe 100644
--- a/t/helper/test-hashmap.c
+++ b/t/helper/test-hashmap.c
@@ -1,3 +1,4 @@
+#include "test-tool.h"
 #include "git-compat-util.h"
 #include "hashmap.h"
 #include "strbuf.h"
@@ -77,7 +78,7 @@ static unsigned int hash(unsigned int method, unsigned int i, const char *key)
 
 /*
  * Test performance of hashmap.[ch]
- * Usage: time echo "perfhashmap method rounds" | test-hashmap
+ * Usage: time echo "perfhashmap method rounds" | test-tool hashmap
  */
 static void perf_hashmap(unsigned int method, unsigned int rounds)
 {
@@ -144,7 +145,7 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
  *
  * perfhashmap method rounds -> test hashmap.[ch] performance
  */
-int cmd_main(int argc, const char **argv)
+int cmd__hashmap(int argc, const char **argv)
 {
 	struct strbuf line = STRBUF_INIT;
 	struct hashmap map;
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index f52cbcfe67..81bafced8b 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -17,6 +17,7 @@ static struct test_cmd cmds[] = {
 	{ "dump-split-index", cmd__dump_split_index },
 	{ "example-decorate", cmd__example_decorate },
 	{ "genrandom", cmd__genrandom },
+	{ "hashmap", cmd__hashmap },
 	{ "lazy-init-name-hash", cmd__lazy_init_name_hash },
 	{ "sha1", cmd__sha1 },
 };
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index f7ec6ae0c3..fba4bd80b9 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -11,6 +11,7 @@ int cmd__dump_cache_tree(int argc, const char **argv);
 int cmd__dump_split_index(int argc, const char **argv);
 int cmd__example_decorate(int argc, const char **argv);
 int cmd__genrandom(int argc, const char **argv);
+int cmd__hashmap(int argc, const char **argv);
 int cmd__lazy_init_name_hash(int argc, const char **argv);
 int cmd__sha1(int argc, const char **argv);
 
diff --git a/t/t0011-hashmap.sh b/t/t0011-hashmap.sh
index 9c217d948c..3f1f505e89 100755
--- a/t/t0011-hashmap.sh
+++ b/t/t0011-hashmap.sh
@@ -4,7 +4,7 @@ test_description='test hashmap and string hash functions'
 . ./test-lib.sh
 
 test_hashmap() {
-	echo "$1" | test-hashmap $3 > actual &&
+	echo "$1" | test-tool hashmap $3 > actual &&
 	echo "$2" > expect &&
 	test_cmp expect actual
 }
@@ -232,7 +232,7 @@ test_expect_success 'grow / shrink' '
 	echo value40 >> expect &&
 	echo size >> in &&
 	echo 64 39 >> expect &&
-	cat in | test-hashmap > out &&
+	cat in | test-tool hashmap > out &&
 	test_cmp expect out
 
 '