diff --git a/src/compiler.h b/src/compiler.h
new file mode 100644
index 0000000..3a3ec55
--- /dev/null
+++ b/src/compiler.h
@@ -0,0 +1,7 @@
+#ifndef COMPILER_H
+#define COMPILER_H
+
+#define countof(a) (sizeof(a) / sizeof(*(a)))
+
+#endif
+