diff --git a/core/js/js.js b/core/js/js.js
index de27ff7a926..bc4a8413e0b 100644
--- a/core/js/js.js
+++ b/core/js/js.js
@@ -753,20 +753,6 @@ Object.assign(window.OC, {
 		}
 	},
 
-	/**
-	 * Wrapper for matchMedia
-	 *
-	 * This is makes it possible for unit tests to
-	 * stub matchMedia (which doesn't work in PhantomJS)
-	 * @private
-	 */
-	_matchMedia: function(media) {
-		if (window.matchMedia) {
-			return window.matchMedia(media);
-		}
-		return false;
-	},
-
 	/**
 	 * Returns the user's locale as a BCP 47 compliant language tag
 	 *