diff --git a/cad/qucs-s/files/patch-qucs_diagrams_marker.h b/cad/qucs-s/files/patch-qucs_diagrams_marker.h
new file mode 100644
index 000000000000..bbd6ba89f18a
--- /dev/null
+++ b/cad/qucs-s/files/patch-qucs_diagrams_marker.h
@@ -0,0 +1,16 @@
+Fix build with Qt 6.6.x
+
+https://github.com/ra3xdh/qucs_s/issues/375
+https://github.com/ra3xdh/qucs_s/pull/376
+
+--- qucs/diagrams/marker.h.orig	2023-10-26 12:53:59 UTC
++++ qucs/diagrams/marker.h
+@@ -18,6 +18,8 @@
+ #ifndef MARKER_H
+ #define MARKER_H
+ 
++#include <vector>
++
+ #include "element.h"
+ #include "viewpainter.h"
+