diff --git a/tools/sprite-license-audit.py b/tools/sprite-license-audit.py
index 31860ab7..a19f8340 100755
--- a/tools/sprite-license-audit.py
+++ b/tools/sprite-license-audit.py
@@ -32,6 +32,7 @@ LEDGER_FILENAME = "LICENSES.md"
 # Allowed license-column values (must match LICENSES.md whitelist section).
 LICENSE_WHITELIST = {
     "cc0-1.0",
+    "cc-by-3.0",
     "cc-by-4.0",
     "cc-by-sa-4.0",
     "mit",