diff --git a/libs/main/core/piwaitevent_p.cpp b/libs/main/core/piwaitevent_p.cpp
index 23534ec8..fc198814 100644
--- a/libs/main/core/piwaitevent_p.cpp
+++ b/libs/main/core/piwaitevent_p.cpp
@@ -27,6 +27,7 @@
 #else
 #  include <fcntl.h>
 #  include <sys/ioctl.h>
+#  include <errno.h>
 #endif
 #include "pistring.h"