diff --git a/tcpdf/include/TCPDF_STATIC.php b/tcpdf/include/TCPDF_STATIC.php
index 033da28..0d3f89e 100644
--- a/tcpdf/include/TCPDF_STATIC.php
+++ b/tcpdf/include/TCPDF_STATIC.php
@@ -1906,7 +1906,7 @@ class TCPDF_STATIC {
 		if (\strpos($filename, '://')) {
 			return false; // only support http and https wrappers for security reasons
 		}
-		return @\file_exists($filename);
+		return @\is_file($filename);
 	}
 
 	/**