diff --git a/lib/private/Template/JSCombiner.php b/lib/private/Template/JSCombiner.php
index 48f6dadfd6acb..caf6ec43dae9d 100644
--- a/lib/private/Template/JSCombiner.php
+++ b/lib/private/Template/JSCombiner.php
@@ -121,7 +121,9 @@ protected function isCached($fileName, ISimpleFolder $folder) {
 		$fileName = $fileName . '.deps';
 		try {
 			$deps = $this->depsCache->get($folder->getName() . '-' . $fileName);
+			$fromCache = true;
 			if ($deps === null || $deps === '') {
+				$fromCache = false;
 				$depFile = $folder->getFile($fileName);
 				$deps = $depFile->getContent();
 			}
@@ -144,6 +146,10 @@ protected function isCached($fileName, ISimpleFolder $folder) {
 				}
 			}
 
+			if ($fromCache === false) {
+				$this->depsCache->set($folder->getName() . '-' . $fileName, json_encode($deps));
+			}
+
 			return true;
 		} catch (NotFoundException $e) {
 			return false;