diff --git a/js/ui/environment.js b/js/ui/environment.js
index 224456d6a..353cd35f6 100644
--- a/js/ui/environment.js
+++ b/js/ui/environment.js
@@ -398,12 +398,6 @@ function init() {
         return Shell.util_touch_file_finish(this, result);
     };
 
-    St.set_slow_down_factor = function (factor) {
-        let { stack } = new Error();
-        log(`St.set_slow_down_factor() is deprecated, use St.Settings.slow_down_factor\n${stack}`);
-        St.Settings.get().slow_down_factor = factor;
-    };
-
     let origToString = Object.prototype.toString;
     Object.prototype.toString = function () {
         let base = origToString.call(this);