diff --git a/include/mimalloc/internal.h b/include/mimalloc/internal.h
index 4b211d71..fb359763 100644
--- a/include/mimalloc/internal.h
+++ b/include/mimalloc/internal.h
@@ -239,20 +239,6 @@ bool        _mi_page_is_valid(mi_page_t* page);
 #endif
 
 
-// ------------------------------------------------------
-// Debug
-// ------------------------------------------------------
-
-#if !defined(MI_DEBUG_UNINIT)
-#define MI_DEBUG_UNINIT     (0xD0)
-#endif
-#if !defined(MI_DEBUG_FREED)
-#define MI_DEBUG_FREED      (0xDF)
-#endif
-#if !defined(MI_DEBUG_PADDING)
-#define MI_DEBUG_PADDING    (0xDE)
-#endif
-
 /* -----------------------------------------------------------
   Assertions
 ----------------------------------------------------------- */
diff --git a/include/mimalloc/types.h b/include/mimalloc/types.h
index 03d522b5..77752398 100644
--- a/include/mimalloc/types.h
+++ b/include/mimalloc/types.h
@@ -562,5 +562,19 @@ struct mi_tld_s {
 #define EOVERFLOW (75)
 #endif
 
+// ------------------------------------------------------
+// Debug
+// ------------------------------------------------------
+
+#ifndef MI_DEBUG_UNINIT
+#define MI_DEBUG_UNINIT     (0xD0)
+#endif
+#ifndef MI_DEBUG_FREED
+#define MI_DEBUG_FREED      (0xDF)
+#endif
+#ifndef MI_DEBUG_PADDING
+#define MI_DEBUG_PADDING    (0xDE)
+#endif
+
 
 #endif // MI_TYPES_H