diff --git a/lib/py_lint_adapter.rb b/lib/py_lint_adapter.rb
index 57c58a3d..cd9adea4 100644
--- a/lib/py_lint_adapter.rb
+++ b/lib/py_lint_adapter.rb
@@ -1,5 +1,5 @@
 class PyLintAdapter < TestingFrameworkAdapter
-  REGEXP = /Your code has been rated at (\d+\.?\d*)\/(\d+\.?\d*)/
+  REGEXP = /Your code has been rated at (-?\d+\.?\d*)\/(\d+\.?\d*)/
   ASSERTION_ERROR_REGEXP = /^.*?\(.*?,\ (.*?),.*?\)\ (.*?)$/m
 
   def self.framework_name
@@ -7,10 +7,17 @@ class PyLintAdapter < TestingFrameworkAdapter
   end
 
   def parse_output(output)
-    captures = REGEXP.match(output[:stdout]).captures.map(&:to_f)
-    count = captures.second
-    passed = captures.first
-    failed = count - passed
+    regex_match = REGEXP.match(output[:stdout])
+    if regex_match.blank?
+      count = 0
+      failed = 0
+    else
+      captures = regex_match.captures.map(&:to_f)
+      count = captures.second
+      passed = captures.first
+      failed = count - passed
+    end
+
     begin
       assertion_error_matches = Timeout.timeout(2.seconds) do
         output[:stdout].scan(ASSERTION_ERROR_REGEXP).map { |match|