diff --git a/lib/formatters/ansi_common.rb b/lib/formatters/ansi_common.rb
index 15646a5..f72b649 100644
--- a/lib/formatters/ansi_common.rb
+++ b/lib/formatters/ansi_common.rb
@@ -3,10 +3,10 @@ require_relative 'ansi_colors'
 # gather common definitions and functions
 class AnsiCommon
   def self.ansi_trace(trace)
-    match = trace.match(/(↳ )?(.*:\d+):in `(.*)'/)
+    match = trace.match(/(↳ )?(.*:\d+)(:in `)?(.*')/) # only m2(=file) and m4(=optional function) are useful
     return trace unless match
 
-    _, m2, m3 = match.captures
-    "➟ #{m2} #{AnsiColors::BOLD}#{m3}#{AnsiColors::CLEAR}"
+    _, m2, _, m4 = match.captures
+    "➟ #{m2} #{AnsiColors::BOLD}#{m4.chop}#{AnsiColors::CLEAR}"
   end
 end