@@ -30,12 +30,13 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
 #include <limits.h>
 
-#include "macros.h"
 #include "block.h"
+#include "macros.h"
+#include "once.h"
 
 /*
  * Some versions of MinGW require <winsock2.h> to be included before
  * <windows.h>. Do this here to make sure this is always done in the correct
  * order, even if another header includes just <windows.h>.
@@ -1315,10 +1316,12 @@
 #endif
 extern id of_alloc_object(Class class_, size_t extraSize,
     size_t extraAlignment, void *_Nullable *_Nullable extra);
 extern void OF_NO_RETURN_FUNC of_method_not_found(id self, SEL _cmd);
 extern uint32_t of_hash_seed;
+/* This does *NOT* provide cryptographically secure randomness! */
+extern uint32_t of_random(void);
 #ifdef __cplusplus
 }
 #endif
 
 OF_ASSUME_NONNULL_END