diff --git a/src/propeller/utils.cljc b/src/propeller/utils.cljc
index 30d2c0a..7598f17 100755
--- a/src/propeller/utils.cljc
+++ b/src/propeller/utils.cljc
@@ -51,7 +51,7 @@
   "Returns a random instruction from a supplied pool of instructions, evaluating
   ERC-producing functions to a constant literal."
   [instructions argmap]
-  (case (:closes argmap)
+  (case (or (:closes argmap) :specified)
     :specified (let [instruction (rand-nth instructions)]
                  (if (fn? instruction)
                    (instruction)