diff --git a/src/augmax/colorspace.py b/src/augmax/colorspace.py
index 7272cae..afe15df 100644
--- a/src/augmax/colorspace.py
+++ b/src/augmax/colorspace.py
@@ -272,7 +272,7 @@ def pixelwise(self, rng: jnp.ndarray, pixel: jnp.ndarray, invert=False) -> jnp.n
                     amount = -amount
                 hue = hue + amount
             elif op == 'saturation':
-                F.adjust_brightness(saturation, amount, invert=invert)
+                saturation = F.adjust_brightness(saturation, amount, invert=invert)
 
         transformed = hsv_to_rgb(hue, saturation, value)