diff --git a/src/MDConcLicenses.php b/src/MDConcLicenses.php
index e8ff978..654a093 100644
--- a/src/MDConcLicenses.php
+++ b/src/MDConcLicenses.php
@@ -12,9 +12,10 @@ declare(strict_types = 1);
 final class MDConcLicenses implements MDImporterConcordanceListInterface {
 
     private const LICENSES_LIST = [
+        "CCO" => "CC0",
         "CC 0" => "CC0",
         "CC_0" => "CC0",
-        "CC O" => "CC",
+        "CC O" => "CC0",
         "CC0 1.0" => "CC0",
         "CC 0 1.0" => "CC0",
         "CC_0 1.0" => "CC0",