diff --git a/color_HSL_adjust.py b/color_HSL_adjust.py
index 303b1f39d188f42d1de5c59c3edceacf3f12e20d..1425ba0d6530ba046c9530229b36d8efa299f7b6 100755
--- a/color_HSL_adjust.py
+++ b/color_HSL_adjust.py
@@ -19,7 +19,7 @@ class HslAdjust(inkex.ColorExtension):
         if self.options.random_hue:
             color.hue = int(random.random() * 255.0)
         elif self.options.hue:
-            color.hue += (self.options.hue * 2.55)
+            color.hue += (self.options.hue * 256.0/360)
 
         if self.options.random_saturation:
             color.saturation = int(random.random() * 255.0)
diff --git a/tests/test_color_HSL_adjust.py b/tests/test_color_HSL_adjust.py
index bd0753dfe9323c649f2f21e057a36b89309691ce..5b01f408bd3f18a1166230e815e7c88d18b4640b 100644
--- a/tests/test_color_HSL_adjust.py
+++ b/tests/test_color_HSL_adjust.py
@@ -9,11 +9,11 @@ class ColorHSLAdjustTest(ColorBaseCase):
         ((255, 255, 255), "#ffffff"),
         ((0, 0, 0), "#000000"),
         ((0, 128, 0), "#008000"),
-        ((91, 166, 176), "#5a74af", ['-x 10']),
-        ((91, 166, 176), "#745aaf", ['-x 320']),
+        ((91, 166, 176), "#5a98af", ['-x 10']),
+        ((91, 166, 176), "#5aaf80", ['-x 320']),
         ((91, 166, 176), "#5ba6b0", ['-x 0']),
-        ((91, 166, 176), "#af5a6c", ['-x 12345']),
-        ((91, 166, 176), "#5aacaf", ['-x -1']),
+        ((91, 166, 176), "#af5a78", ['-x 12345']),
+        ((91, 166, 176), "#5aa8af", ['-x -1']),
         ((91, 166, 176), "#4eafbb", ['-s 10']),
         ((91, 166, 176), "#0be5fe", ['-s 90']),
         ((91, 166, 176), "#5ba6b0", ['-s 0']),