diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c
index 2f8134f787..d8a9729b2f 100644
--- a/libavfilter/vsrc_mandelbrot.c
+++ b/libavfilter/vsrc_mandelbrot.c
@@ -67,7 +67,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
     AVRational frame_rate_q;
     int ret;
 
-    mb->maxiter=1024;
+    mb->maxiter=4096;
     mb->start_x=-0.743643887037158704752191506114774;
     mb->start_y=-0.131825904205311970493132056385139;
     mb->start_scale=3.0;