diff --git a/src/add-ons/print/transports/parallel_port/print_transport.cpp b/src/add-ons/print/transports/parallel_port/print_transport.cpp
index bc8d4c2ed7..fff4bca1cd 100644
--- a/src/add-ons/print/transports/parallel_port/print_transport.cpp
+++ b/src/add-ons/print/transports/parallel_port/print_transport.cpp
@@ -30,6 +30,7 @@
 /*****************************************************************************/
 
 #include <stdio.h>
+#include <unistd.h>
 
 #include <StorageKit.h>
 #include <SupportKit.h>