--- a/checkbashisms	2017-08-28 08:42:38.000000000 +0200
+++ b/checkbashisms	2017-09-08 19:47:57.154908415 +0200
@@ -440,7 +440,7 @@
 	    # Finally the whole subexpression may be omitted for scripts
 	    # which do not pass on their parameters (i.e. after re-execing
 	    # they take their parameters (and potentially data) from stdin
-	    .?(\${1:?\+.?)?(\$(\@|\*))?~x) {
+	    .?(\$[{]1:?\+.?)?(\$(\@|\*))?~x) {
             $ret = $. - 1;
             last;
         } elsif (/^\s*(\w+)=\$0;/) {
@@ -453,7 +453,7 @@
 	    # As above
 	    .?\$$var.?\s*
 	    (--\s*)?
-	    .?(\${1:?\+.?)?(\$(\@|\*))?.?\s*\&~x) {
+	    .?(\$[{]1:?\+.?)?(\$(\@|\*))?.?\s*\&~x) {
 
 	    $backgrounded = 1;
 	} elsif ($backgrounded and m~