diff --git a/src/brei-shared.c b/src/brei-shared.c
index 5751786..f98e1aa 100644
--- a/src/brei-shared.c
+++ b/src/brei-shared.c
@@ -678,7 +678,7 @@ MUNIT_TEST(test_brei_send_message)
 		buffer_debug(buf, len);
 
 		const struct brei_header *header = (const struct brei_header*)buf;
-		munit_assert_int(header->sender_id, ==, id);
+		munit_assert_uint64(header->sender_id, ==, id);
 		munit_assert_int(header->msglen, ==, msglen);
 		munit_assert_int(header->opcode, ==, opcode);
 
@@ -692,8 +692,8 @@ MUNIT_TEST(test_brei_send_message)
 		munit_assert_string_equal(protostring, string);
 		munit_assert_int(memcmp(protostring, string, brei_string_proto_length(slen) - 4), ==, 0);
 
-		munit_assert_int(buf[6 + string_len/4], ==, 0xab);
-		munit_assert_int(buf[8 + string_len/4], ==, 0xcdef);
+		munit_assert_uint64(buf[6 + string_len/4], ==, 0xab);
+		munit_assert_uint64(buf[8 + string_len/4], ==, 0xcdef);
 	}
 
 	{
@@ -714,7 +714,7 @@ MUNIT_TEST(test_brei_send_message)
 		buffer_debug(buf, len);
 
 		const struct brei_header *header = (const struct brei_header*)buf;
-		munit_assert_int(header->sender_id, ==, id);
+		munit_assert_uint64(header->sender_id, ==, id);
 		munit_assert_int(header->msglen, ==, msglen);
 		munit_assert_int(header->opcode, ==, opcode);
 
@@ -763,7 +763,7 @@ MUNIT_TEST(test_brei_send_message)
 		uint32_t *buf = (uint32_t*)iobuf_data(recv);
 		munit_assert_int(len, ==, msglen);
 		const struct brei_header *header = (const struct brei_header*)buf;
-		munit_assert_int(header->sender_id, ==, id);
+		munit_assert_uint64(header->sender_id, ==, id);
 		munit_assert_int(header->msglen, ==, msglen);
 		munit_assert_int(header->opcode, ==, opcode);