diff --git a/src/propeller/variation.cljc b/src/propeller/variation.cljc
index d04d1f3..5df807a 100755
--- a/src/propeller/variation.cljc
+++ b/src/propeller/variation.cljc
@@ -44,7 +44,7 @@
        (crossover (:plushy (selection/select-parent pop argmap))
                   (:plushy (selection/select-parent pop argmap)))
        (< prob (+ (:crossover (:variation argmap))
-                  (:umad (:variation argmap)) 2))
+                  (:umad (:variation argmap))))
        (uniform-deletion (uniform-addition (:plushy (selection/select-parent pop argmap))
                                            (:instructions argmap)
                                            (:umad-rate argmap))