diff --git a/error_handling.lua b/error_handling.lua
index 33f9764..ba3389a 100644
--- a/error_handling.lua
+++ b/error_handling.lua
@@ -115,6 +115,9 @@ print_error = function(error_message, start_fn, stop_fn)
             calling_fn.lastlinedefined = assert(map[calling_fn.lastlinedefined])
           end
           local filename, start, stop = calling_fn.source:match('@([^[]*)%[([0-9]+):([0-9]+)]')
+          if not filename then
+            filename, start = calling_fn.source:match('@([^[]*)%[([0-9]+)]')
+          end
           assert(filename)
           local file = files.read(filename)
           if calling_fn.name then
diff --git a/error_handling.moon b/error_handling.moon
index f43d6ba..97e5fe6 100644
--- a/error_handling.moon
+++ b/error_handling.moon
@@ -75,6 +75,8 @@ print_error = (error_message, start_fn, stop_fn)->
                 calling_fn.lastlinedefined = assert(map[calling_fn.lastlinedefined])
             --calling_fn.short_src = calling_fn.source\match('"([^[]*)')
             filename,start,stop = calling_fn.source\match('@([^[]*)%[([0-9]+):([0-9]+)]')
+            if not filename
+                filename,start = calling_fn.source\match('@([^[]*)%[([0-9]+)]')
             assert(filename)
             file = files.read(filename)
             -- TODO: get name properly