diff --git a/src/propeller/variation.cljc b/src/propeller/variation.cljc
index 7c2acd3..1c01464 100755
--- a/src/propeller/variation.cljc
+++ b/src/propeller/variation.cljc
@@ -18,7 +18,7 @@
 
 (defn diploid-crossover
   "Crosses over two individuals using uniform crossover. Pads shorter one."
-  [plushy-a plushy-b argmap]
+  [plushy-a plushy-b]
   (let [plushy-a (partition 2 plushy-a)
         plushy-b (partition 2 plushy-b)
         shorter (min-key count plushy-a plushy-b)