diff --git a/lib/private/Preview/MarkDown.php b/lib/private/Preview/MarkDown.php
index 54648ac183739..d809c6a944333 100644
--- a/lib/private/Preview/MarkDown.php
+++ b/lib/private/Preview/MarkDown.php
@@ -126,7 +126,7 @@ public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
 					$nextLineStart -= $actualFontSize;
 				}
 			} else {
-				$y -= (int)$fontSize;
+				$y -= $fontSize;
 				imagestring($image, 1, $x, $y, $line, $textColor);
 				$nextLineStart = $fontSize;
 			}