diff --git a/src/js/controls.js b/src/js/controls.js
index 4f453e6a..f414f6d6 100644
--- a/src/js/controls.js
+++ b/src/js/controls.js
@@ -1587,7 +1587,7 @@ const controls = {
 
         // If function, run it and use output
         if (is.function(this.config.controls)) {
-            this.config.controls = this.config.controls.call(this.props);
+            this.config.controls = this.config.controls.call(this, props);
         }
 
         // Convert falsy controls to empty array (primarily for empty strings)
diff --git a/src/sass/components/progress.scss b/src/sass/components/progress.scss
index 16992808..f28a19ca 100644
--- a/src/sass/components/progress.scss
+++ b/src/sass/components/progress.scss
@@ -42,13 +42,13 @@
 
     &::-webkit-progress-bar {
         background: transparent;
-        transition: width 0.2s ease;
     }
 
     &::-webkit-progress-value {
         background: currentColor;
         border-radius: 100px;
         min-width: $plyr-range-track-height;
+        transition: width 0.2s ease;
     }
 
     // Mozilla