diff --git a/effects.py b/effects.py
index 165acb0..0bf4aba 100644
--- a/effects.py
+++ b/effects.py
@@ -62,7 +62,8 @@ def adjust_hsv(framecount, index, target, params):
     delta_v = params['delta_v']
     rgb = sRGBColor(target[0], target[1], target[2], True)
     hsv = convert_color(rgb, HSVColor)
-    hsv.hsv_h = min(hsv.hsv_h+delta_h, 360)
+    new_hue = math.fmod(hsv.hsv_h+delta_h, 360)
+    hsv.hsv_h = new_hue if new_hue >= 0 else 360+new_hue
     hsv.hsv_s = min(hsv.hsv_s*factor_s+delta_s,1)
     hsv.hsv_v = min(hsv.hsv_v*factor_v+delta_v,1)
     hsv_to_target(hsv, target)