diff --git a/errmsg.h b/errmsg.h
index f2c7968..3a56fee 100644
--- a/errmsg.h
+++ b/errmsg.h
@@ -7,7 +7,7 @@
 #define __attribute__(x)
 #endif
 /* for exit(): */
-#include <unistd.h>
+#include <stdlib.h>
 
 /* These use file descriptor 2, not buffer_2!
  * Call buffer_flush(buffer_2) before calling these! */