diff --git a/frontend/main.c b/frontend/main.c
index 530d44f5..c688c19a 100644
--- a/frontend/main.c
+++ b/frontend/main.c
@@ -2529,6 +2529,7 @@ static void
 wet_output_overlap_pre_enable(struct weston_head *head,
 			      struct weston_head *head_to_mirror)
 {
+	head->output->mirror_of = head_to_mirror->output;
 	weston_output_set_position(head->output, head_to_mirror->output->pos);
 }
 
@@ -3811,6 +3812,12 @@ vnc_backend_output_configure(struct weston_output *output)
 
 	weston_config_section_get_bool(section, "resizeable", &resizeable, true);
 
+	if (output->mirror_of && resizeable) {
+		resizeable = false;
+		weston_log("Use of mirror_of disables resizing for output %s\n", output->name);
+
+	}
+
 	wet_output_set_scale(output, section, 1, 0);
 	weston_output_set_transform(output, WL_OUTPUT_TRANSFORM_NORMAL);
 
diff --git a/include/libweston/libweston.h b/include/libweston/libweston.h
index 137ad172..e52c48c2 100644
--- a/include/libweston/libweston.h
+++ b/include/libweston/libweston.h
@@ -705,6 +705,12 @@ struct weston_output {
 	 */
 	void (*detach_head)(struct weston_output *output,
 			    struct weston_head *head);
+
+	/**
+	 * When set, this output is a mirror-of another output. See
+	 * mirror-of key in [output] section.
+	 */
+	struct weston_output *mirror_of;
 };
 
 enum weston_pointer_motion_mask {