diff --git a/Object.h b/Object.h
index 36e17b3b..e18fb972 100644
--- a/Object.h
+++ b/Object.h
@@ -11,14 +11,11 @@ in the source distribution for its full text.
 #include "config.h" // IWYU pragma: keep
 
 #include <assert.h>
+#include <stdbool.h>
 
 #include "RichString.h"
 #include "XUtils.h" // IWYU pragma: keep
 
-#ifndef NDEBUG
-#include <stdbool.h>
-#endif
-
 
 struct Object_;
 typedef struct Object_ Object;