diff --git a/src/backends/drm/drm_pipeline_legacy.cpp b/src/backends/drm/drm_pipeline_legacy.cpp
index 8235196867..382ac8baa4 100644
--- a/src/backends/drm/drm_pipeline_legacy.cpp
+++ b/src/backends/drm/drm_pipeline_legacy.cpp
@@ -14,6 +14,8 @@
 #include "drm_object_connector.h"
 #include "logging.h"
 
+#include <errno.h>
+
 namespace KWin
 {