diff --git a/src/wayland/autotests/client/test_error.cpp b/src/wayland/autotests/client/test_error.cpp
index 7e6a793f27..b958fd48be 100644
--- a/src/wayland/autotests/client/test_error.cpp
+++ b/src/wayland/autotests/client/test_error.cpp
@@ -35,6 +35,8 @@ License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <wayland-client-protocol.h>
 
+#include <errno.h>  // For EPROTO
+
 using namespace KWayland::Client;
 using namespace KWayland::Server;