diff --git a/tests/test_seq.c b/tests/test_seq.c
index e5a8954..e128457 100644
--- a/tests/test_seq.c
+++ b/tests/test_seq.c
@@ -9,7 +9,9 @@
 #include "libmctp.h"
 #include "test-utils.h"
 
+#ifndef ARRAY_SIZE
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+#endif
 
 struct test_ctx {
 	struct mctp			*mctp;