diff --git a/mozilla/tools/rb/fix-linux-stack.pl b/mozilla/tools/rb/fix-linux-stack.pl
index 2ae216e9b91..1749ec9d993 100755
--- a/mozilla/tools/rb/fix-linux-stack.pl
+++ b/mozilla/tools/rb/fix-linux-stack.pl
@@ -54,7 +54,7 @@ use IPC::Open2;
 my %pipes;
 while (<>) {
     my $line = $_;
-    if ($line =~ /^([ \|0-9-]*)(.*) \[([^ ]*) \+(0x[0-9A-F]{8})\](.*)$/) {
+    if ($line =~ /^([ \|0-9-]*)(.*) ?\[([^ ]*) \+(0x[0-9A-F]{1,8})\](.*)$/) {
         my $before = $1; # allow preservation of balance trees
         my $badsymbol = $2;
         my $file = $3;