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Index: lib/Mail/SpamAssassin/Plugin/MIMEEval.pm
===================================================================
--- lib/Mail/SpamAssassin/Plugin/MIMEEval.pm	(revision 929342)
+++ lib/Mail/SpamAssassin/Plugin/MIMEEval.pm	(revision 929343)
@@ -498,7 +498,7 @@
     # perhaps just limit to test, and image?
     next if ($ctype eq 'application/ics');
 
-    my $cte = lc $p->get_header('content-transfer-encoding') || '';
+    my $cte = lc($p->get_header('content-transfer-encoding') || '');
     next if ($cte !~ /^base64$/);
     foreach my $l ( @{$p->raw()} ) {
       my $len = length $l;