diff --git a/linker/linker_debug.h b/linker/linker_debug.h
index 17c6986..5af9929 100644
--- a/linker/linker_debug.h
+++ b/linker/linker_debug.h
@@ -55,6 +55,7 @@
  *********************************************************************/
 
 #include "private/libc_logging.h"
+#include <unistd.h>
 
 __LIBC_HIDDEN__ extern int g_ld_debug_verbosity;