diff --git a/scripts/dedup.py b/scripts/dedup.py
index 4da00695..36767ead 100644
--- a/scripts/dedup.py
+++ b/scripts/dedup.py
@@ -36,6 +36,9 @@ DEFAULT_BIOS_DIR = "bios"
 NODEDUP_DIRS = {
     "RPG Maker",
     "ScummVM",
+    # A zoneinfo tree is addressed by zone name and its aliases are equal
+    # files by design: US/Samoa is Pacific/Midway.
+    "tzdata",
 }