diff --git a/base/baselocl.h b/base/baselocl.h
index fe85b7ef9..8de3b7109 100644
--- a/base/baselocl.h
+++ b/base/baselocl.h
@@ -38,10 +38,13 @@
 #include <string.h>
 #include <errno.h>
 #include <limits.h>
-#include <unistd.h>
 
 #include "config.h"
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #include "heimqueue.h"
 #include "heim_threads.h"
 #include "heimbase.h"