diff --git a/src/effects.js b/src/effects.js
index 623d3c0..eabf639 100644
--- a/src/effects.js
+++ b/src/effects.js
@@ -139,7 +139,7 @@ export const render_initial_state = (ui, state, example) => {
   }
 }
 
-export const apply_side_effects = (prev, next, command, ui) => {
+export const apply_side_effects = (prev, next, ui) => {
   if(prev.project_dir != next.project_dir) {
     ui.files.render(next)
   }
diff --git a/src/index.js b/src/index.js
index 39fcec2..94f298e 100644
--- a/src/index.js
+++ b/src/index.js
@@ -307,7 +307,7 @@ export const exec = (cmd, ...args) => {
   // Wrap with_code_execution, because rendering values can trigger execution
   // of code by toString() and toJSON() methods
   with_code_execution(() => {
-    apply_side_effects(state, nextstate, cmd, ui);
+    apply_side_effects(state, nextstate, ui)
 
     if(effects != null) {
       (Array.isArray(effects) ? effects : [effects]).forEach(e => {