diff --git a/git-send-email.perl b/git-send-email.perl
index c012b9556..5a0c4a8ae 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -365,7 +365,7 @@ sub read_config {
 if (@suppress_cc) {
 	foreach my $entry (@suppress_cc) {
 		die "Unknown --suppress-cc field: '$entry'\n"
-			unless $entry =~ /^(all|cccmd|cc|author|self|sob|body|bodycc)$/;
+			unless $entry =~ /^(?:all|cccmd|cc|author|self|sob|body|bodycc)$/;
 		$suppress_cc{$entry} = 1;
 	}
 }