diff --git a/src/propeller/problems/software/number_io.cljc b/src/propeller/problems/software/number_io.cljc
index 2acae61..fcbef5f 100755
--- a/src/propeller/problems/software/number_io.cljc
+++ b/src/propeller/problems/software/number_io.cljc
@@ -71,9 +71,9 @@
                            program
                            (assoc state/empty-state :input {:in1 (first input)
                                                             :in2 (last input)}
-                                                    :output '(""))
+                                                    :print '(""))
                            (:step-limit argmap))
-                         :output))
+                         :print))
                      inputs)
         parsed-outputs (map (fn [output]
                               (try (read-string output)
diff --git a/src/propeller/problems/software/smallest.cljc b/src/propeller/problems/software/smallest.cljc
index a70ac59..9ca4dbb 100755
--- a/src/propeller/problems/software/smallest.cljc
+++ b/src/propeller/problems/software/smallest.cljc
@@ -75,9 +75,9 @@
                                                             :in2 (get input 1)
                                                             :in3 (get input 2)
                                                             :in4 (get input 3)}
-                                                    :output '(""))
+                                                    :print '(""))
                            (:step-limit argmap))
-                         :output))
+                         :print))
                      inputs)
         errors (map (fn [correct-output output]
                       (let [parsed-output (try (read-string output)
diff --git a/src/propeller/push/instructions/input_output.cljc b/src/propeller/push/instructions/input_output.cljc
index 9d52d54..b597c7b 100755
--- a/src/propeller/push/instructions/input_output.cljc
+++ b/src/propeller/push/instructions/input_output.cljc
@@ -31,9 +31,9 @@
   :print_newline
   ^{:stacks [:print]}
   (fn [state]
-    (let [current-output (state/peek-stack state :output)
-          popped-state (state/pop-stack state :output)]
-      (state/push-to-stack popped-state :output (str current-output \newline)))))
+    (let [current-output (state/peek-stack state :print)
+          popped-state (state/pop-stack state :print)]
+      (state/push-to-stack popped-state :print (str current-output \newline)))))
 
 (def _print
   ^{:stacks [:print]
@@ -46,10 +46,10 @@
                                  (char? top-item))
                            top-item
                            (pr-str top-item))
-            current-output (state/peek-stack state :output)
-            popped-state (state/pop-stack (state/pop-stack state stack) :output)]
+            current-output (state/peek-stack state :print)
+            popped-state (state/pop-stack (state/pop-stack state stack) :print)]
         (state/push-to-stack popped-state
-                             :output
+                             :print
                              (str current-output top-item-str))))))
 
 (generate-instructions
diff --git a/src/propeller/push/state.cljc b/src/propeller/push/state.cljc
index b49227e..647509c 100755
--- a/src/propeller/push/state.cljc
+++ b/src/propeller/push/state.cljc
@@ -7,8 +7,9 @@
                       :exec           '()
                       :float          '()
                       :input          {}
+                      :output         {}
                       :integer        '()
-                      :output         '("")
+                      :print          '("")
                       :string         '()
                       :vector_boolean '()
                       :vector_float   '()