diff --git a/visor.c b/visor.c
index e74e9af..f8907d6 100644
--- a/visor.c
+++ b/visor.c
@@ -69,6 +69,10 @@ void draw_mandelbrot(struct threadInfo *info);
 void color_from_iteration(int *r, int *g, int *b, double x0, double y0);
 void color_lookup(int *r, int *g, int *b, double mu);
 
+// This function is from the main thread, but it needs to be referenced by
+// worker code
+gboolean queue_redraw_plane(void *arg);
+
 void *writer_thread(void *arg)
 {
 	struct threadInfo *info = arg;
@@ -131,6 +135,7 @@ void draw_mandelbrot(struct threadInfo *info)
 	}
 	if (allWritersComplete) {
 		cairo_surface_mark_dirty(surface);
+		g_main_context_invoke(NULL, queue_redraw_plane, NULL);
 	}
 	pthread_mutex_unlock(&pixmapMutex);
 }
@@ -285,6 +290,8 @@ void print_usage(FILE *stream)
 	fprintf(stream, "%s", err_msg);
 }
 
+GtkDrawingArea *da;
+
 static void app_activate(GApplication *app)
 {
 	GtkWidget *win;
@@ -292,7 +299,6 @@ static void app_activate(GApplication *app)
 	GtkWidget *btn2;
 	GtkWidget *bigBox;
 	GtkWidget *vertBox;
-	GtkDrawingArea *da;
 
 	win = gtk_application_window_new(GTK_APPLICATION(app));
 	gtk_window_set_title(GTK_WINDOW(win), "Mandelbrot visualiser");
@@ -318,6 +324,7 @@ static void app_activate(GApplication *app)
 
 	bigBox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
 
+	// global to enable other functions to call for a redraw
 	da = g_object_new(GTK_TYPE_DRAWING_AREA,
 			"accessible-role", GTK_ACCESSIBLE_ROLE_IMG,
 			NULL);
@@ -336,6 +343,25 @@ static void app_activate(GApplication *app)
 	gtk_window_present(GTK_WINDOW(win));
 }
 
+gboolean queue_redraw_plane(void *arg)
+{
+	(void) arg;
+	bool allWritersHadCompleted = true;
+	for (int32_t i = 0; i < thread_count; i++) {
+		if (!threads[i].complete) {
+			allWritersHadCompleted = false;
+			break;
+		}
+	}
+
+	if (!allWritersHadCompleted) {
+		return G_SOURCE_REMOVE;
+	}
+
+	gtk_widget_queue_draw(GTK_WIDGET(da));
+	return G_SOURCE_REMOVE;
+}
+
 void blit_plane(GtkDrawingArea *da, cairo_t *cr, int width, int height, gpointer data)
 {
 	(void) da;