--- loncom/interface/lonprintout.pm	2023/04/15 19:33:17	1.689
+++ loncom/interface/lonprintout.pm	2023/04/15 21:50:34	1.690
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Printout
 #
-# $Id: lonprintout.pm,v 1.689 2023/04/15 19:33:17 raeburn Exp $
+# $Id: lonprintout.pm,v 1.690 2023/04/15 21:50:34 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -3906,7 +3906,7 @@ sub print_resources {
 			$rendered =~ s/\\end\{document}//;
 		    }
 		    $current_output .= $rendered.'\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}\strut \vskip 0 mm \strut ';
-		} elsif($res_url = ~/\.pdf$/) {
+		} elsif($res_url =~ /\.pdf$/) {
 		    my $url = &Apache::lonnet::clutter($res_url);
 		    my $rendered  = &include_pdf($url);
 		    if ($remove_latex_header ne 'NO') {