diff --git a/tcpdf/tcpdf.php b/tcpdf/tcpdf.php
index 70ff4c5f..211c9e4c 100755
--- a/tcpdf/tcpdf.php
+++ b/tcpdf/tcpdf.php
@@ -3407,7 +3407,7 @@ if (!class_exists('TCPDF', false)) {
 			} else {
 				$this->FontAscent = 0.8 * $this->FontSize;
 			}
-			if (isset($this->CurrentFont['desc']['Descent']) AND ($this->CurrentFont['desc']['Descent'] > 0)) {
+			if (isset($this->CurrentFont['desc']['Descent']) AND ($this->CurrentFont['desc']['Descent'] < 0)) {
 				$this->FontDescent = - $this->CurrentFont['desc']['Descent'] * $this->FontSize / 1000;
 			} else {
 				$this->FontDescent = 0.2 * $this->FontSize;