diff --git a/api/QgisUntwine_unix.cpp b/api/QgisUntwine_unix.cpp
index dd09fdc..16c536f 100644
--- a/api/QgisUntwine_unix.cpp
+++ b/api/QgisUntwine_unix.cpp
@@ -4,6 +4,7 @@
 #include <signal.h>
 #include <unistd.h>
 #include <sys/errno.h>
+#include <sys/wait.h>
 
 #include "QgisUntwine.hpp"