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diff --git a/lib/semaphore.h b/lib/semaphore.h
index ad160b1f..fa2e0ee4 100644
--- a/lib/semaphore.h
+++ b/lib/semaphore.h
@@ -15,6 +15,7 @@
 #ifdef CONFIG_DARWIN
 
 #include <unistd.h>
+#include <stdio.h>
 
 /* In Darwin, sem_init() is unfortunately not implemented and the guide
  * recommends emulating it using sem_open().  */
@@ -23,7 +24,7 @@ static inline sem_t *
 sem_alloc(void)
 {
   static uns cnt = 0;
-  byte buf[20];
+  char buf[20];
   sprintf(buf, "tmp/sem-%d-%d", getpid(), cnt++);
   sem_t *sem = sem_open(buf, O_CREAT, 0777, 0);
   ASSERT(sem != (sem_t*) SEM_FAILED);