diff --git a/tests/heavy.c b/tests/heavy.c
index 577a481..9af46c8 100644
--- a/tests/heavy.c
+++ b/tests/heavy.c
@@ -36,6 +36,8 @@
 #include "memory.h"
 #include <math.h>
 
+#include "tests.h"
+
 enum
 {
   ITERS_FIRST = 0,