diff --git a/fftools/ffplay.c b/fftools/ffplay.c
index a280ed3abe..3054820dc3 100644
--- a/fftools/ffplay.c
+++ b/fftools/ffplay.c
@@ -2005,10 +2005,10 @@ static void video_audio_display(VideoState *s)
             /* Least efficient way to do this, we should of course
              * directly access it but it is more than fast enough. */
             if (!SDL_LockTexture(s->vis_texture, &rect, (void **)&pixels, &pitch)) {
+                double w = 1 / sqrt(nb_freq);
                 pitch >>= 2;
                 pixels += pitch * s->height;
                 for (y = 0; y < s->height; y++) {
-                    double w = 1 / sqrt(nb_freq);
                     int a = sqrt(w * sqrt(data[0][y].re * data[0][y].re + data[0][y].im * data[0][y].im));
                     int b = (nb_display_channels == 2 ) ? sqrt(w * hypot(data[1][y].re, data[1][y].im))
                                                         : a;