diff --git a/legacy/eet/src/lib/eet_lib.c b/legacy/eet/src/lib/eet_lib.c
index 58a5d7859c..64c8f3737f 100644
--- a/legacy/eet/src/lib/eet_lib.c
+++ b/legacy/eet/src/lib/eet_lib.c
@@ -2,6 +2,7 @@
  * vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
  */
 
+#include <sys/types.h>
 #include <sys/mman.h>
 
 #include "Eet.h"