diff --git a/test/test-client-escape.c b/test/test-client-escape.c
index 43998fc..d7a9957 100644
--- a/test/test-client-escape.c
+++ b/test/test-client-escape.c
@@ -150,7 +150,7 @@
 	},
 };
 
-#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 
 struct test_ctx ctxs[ARRAY_SIZE(tests)];