diff --git a/tools/testing/selftests/bpf/prog_tests/varlen.c b/tools/testing/selftests/bpf/prog_tests/varlen.c
index c75525eab02c..dd324b4933db 100644
--- a/tools/testing/selftests/bpf/prog_tests/varlen.c
+++ b/tools/testing/selftests/bpf/prog_tests/varlen.c
@@ -44,25 +44,25 @@ void test_varlen(void)
 	CHECK_VAL(bss->payload1_len2, size2);
 	CHECK_VAL(bss->total1, size1 + size2);
 	CHECK(memcmp(bss->payload1, exp_str, size1 + size2), "content_check",
-	      "doesn't match!");
+	      "doesn't match!\n");
 
 	CHECK_VAL(data->payload2_len1, size1);
 	CHECK_VAL(data->payload2_len2, size2);
 	CHECK_VAL(data->total2, size1 + size2);
 	CHECK(memcmp(data->payload2, exp_str, size1 + size2), "content_check",
-	      "doesn't match!");
+	      "doesn't match!\n");
 
 	CHECK_VAL(data->payload3_len1, size1);
 	CHECK_VAL(data->payload3_len2, size2);
 	CHECK_VAL(data->total3, size1 + size2);
 	CHECK(memcmp(data->payload3, exp_str, size1 + size2), "content_check",
-	      "doesn't match!");
+	      "doesn't match!\n");
 
 	CHECK_VAL(data->payload4_len1, size1);
 	CHECK_VAL(data->payload4_len2, size2);
 	CHECK_VAL(data->total4, size1 + size2);
 	CHECK(memcmp(data->payload4, exp_str, size1 + size2), "content_check",
-	      "doesn't match!");
+	      "doesn't match!\n");
 cleanup:
 	test_varlen__destroy(skel);
 }
diff --git a/tools/testing/selftests/bpf/progs/test_varlen.c b/tools/testing/selftests/bpf/progs/test_varlen.c
index cd4b72c55dfe..913acdffd90f 100644
--- a/tools/testing/selftests/bpf/progs/test_varlen.c
+++ b/tools/testing/selftests/bpf/progs/test_varlen.c
@@ -15,9 +15,9 @@ int test_pid = 0;
 bool capture = false;
 
 /* .bss */
-long payload1_len1 = 0;
-long payload1_len2 = 0;
-long total1 = 0;
+__u64 payload1_len1 = 0;
+__u64 payload1_len2 = 0;
+__u64 total1 = 0;
 char payload1[MAX_LEN + MAX_LEN] = {};
 
 /* .data */