diff --git a/lib/private/Files/Storage/Wrapper/Encryption.php b/lib/private/Files/Storage/Wrapper/Encryption.php
index ac83d90f81ad6..380ec0f253008 100644
--- a/lib/private/Files/Storage/Wrapper/Encryption.php
+++ b/lib/private/Files/Storage/Wrapper/Encryption.php
@@ -464,6 +464,7 @@ protected function fixUnencryptedSize(string $path, int $size, int $unencryptedS
 			if (strlen($lastChunkContentEncrypted) > $blockSize) {
 				$newUnencryptedSize += $unencryptedBlockSize;
 				$lastChunkContentEncrypted = substr($lastChunkContentEncrypted, $blockSize);
+				$lastChunkNr++;
 			}
 		}