diff --git a/app/operations/gimpoperationgradient.c b/app/operations/gimpoperationgradient.c
index 9bbc294e1b..2dbb74666d 100644
--- a/app/operations/gimpoperationgradient.c
+++ b/app/operations/gimpoperationgradient.c
@@ -777,6 +777,8 @@ gradient_calc_spiral_factor (gdouble   dist,
       gdouble ang;
       double  r;
 
+      offset = offset / 100.0;
+
       ang0 = atan2 (axis[0], axis[1]) + G_PI;
       ang1 = atan2 (x, y) + G_PI;