diff --git a/src/common/classes/BaseStream.cpp b/src/common/classes/BaseStream.cpp
index 1be2b4c610..818958bb33 100644
--- a/src/common/classes/BaseStream.cpp
+++ b/src/common/classes/BaseStream.cpp
@@ -28,6 +28,9 @@
 #include "BaseStream.h"
 #include <string.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
 namespace MsgFormat
 {