diff --git a/app/procedural_db.c b/app/procedural_db.c
index d48ab84d51..6e015fba9a 100644
--- a/app/procedural_db.c
+++ b/app/procedural_db.c
@@ -19,6 +19,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <string.h>
+#include <sys/types.h>
 #include <regex.h>
 #include "appenv.h"
 #include "general.h"