diff --git a/lib/private/Files/FileInfo.php b/lib/private/Files/FileInfo.php
index 24c4566c25ce0..617f11825ae2e 100644
--- a/lib/private/Files/FileInfo.php
+++ b/lib/private/Files/FileInfo.php
@@ -174,7 +174,7 @@ public function getSize($includeMounts = true) {
 		if ($includeMounts) {
 			$this->updateEntryFromSubMounts();
 
-			if ($this->isEncrypted() && isset($this->data['unencrypted_size'])) {
+			if ($this->isEncrypted() && ($this->data['unencrypted_size'] ?? 0) > 0) {
 				return $this->data['unencrypted_size'];
 			} else {
 				return isset($this->data['size']) ? 0 + $this->data['size'] : 0;