diff --git a/lib/private/Preview/Movie.php b/lib/private/Preview/Movie.php
index 82c84620dc9a..8bdc0f281a76 100644
--- a/lib/private/Preview/Movie.php
+++ b/lib/private/Preview/Movie.php
@@ -63,6 +63,7 @@ public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
 			// in some cases 1MB was no enough to generate thumbnail
 			$firstmb = stream_get_contents($handle, 5242880);
 			file_put_contents($absPath, $firstmb);
+			fclose($handle);
 		}
 
 		$result = $this->generateThumbNail($maxX, $maxY, $absPath, 5);
diff --git a/lib/private/Preview/SVG.php b/lib/private/Preview/SVG.php
index c34f3acf7f77..aa77fb0938bf 100644
--- a/lib/private/Preview/SVG.php
+++ b/lib/private/Preview/SVG.php
@@ -39,10 +39,12 @@ public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
 			$svg = new \Imagick();
 			$svg->setBackgroundColor(new \ImagickPixel('transparent'));
 
-			$content = stream_get_contents($fileview->fopen($path, 'r'));
+			$stream = $fileview->fopen($path, 'r');
+			$content = stream_get_contents($stream);
 			if (substr($content, 0, 5) !== '<?xml') {
 				$content = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>' . $content;
 			}
+			fclose($stream);
 
 			// Do not parse SVG files with references
 			if (stripos($content, 'xlink:href') !== false) {
diff --git a/lib/private/Preview/TXT.php b/lib/private/Preview/TXT.php
index 74a2cdf8b30b..e984f8adf5c7 100644
--- a/lib/private/Preview/TXT.php
+++ b/lib/private/Preview/TXT.php
@@ -44,8 +44,9 @@ public function isAvailable(\OCP\Files\FileInfo $file) {
 	 * {@inheritDoc}
 	 */
 	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
-		$content = $fileview->fopen($path, 'r');
-		$content = stream_get_contents($content,3000);
+		$stream = $fileview->fopen($path, 'r');
+		$content = stream_get_contents($stream,3000);
+		fclose($stream);
 
 		//don't create previews of empty text files
 		if(trim($content) === '') {