diff --git a/FileUtils.h b/FileUtils.h
index d78538d2..35ccba2d 100644
--- a/FileUtils.h
+++ b/FileUtils.h
@@ -11,6 +11,7 @@
 #include <sys/stat.h>
 #include <dirent.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <signal.h>
 
 #include "main.h"
diff --git a/String.h b/String.h
index 0d6cd99e..0696f53e 100644
--- a/String.h
+++ b/String.h
@@ -7,6 +7,8 @@
 #include <pcre.h>
 #endif
 
+#include <sys/types.h>
+
 #include <set>
 #include <map>
 #include <string>