diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/export/ActivityExportingDelegate.kt b/AnkiDroid/src/main/java/com/ichi2/anki/export/ActivityExportingDelegate.kt
index 1bc2fbaf7ea8..5d617228c0d4 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/export/ActivityExportingDelegate.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/export/ActivityExportingDelegate.kt
@@ -121,7 +121,8 @@ class ActivityExportingDelegate(private val activity: AnkiActivity, private val
     }
 
     override fun exportDeckAsApkg(path: String?, did: DeckId, includeSched: Boolean, includeMedia: Boolean) {
-        val deckName = collectionSupplier.get().decks.name(did)
+        // files can't have `/` in their names
+        val deckName = collectionSupplier.get().decks.name(did).replace("/", "_")
         val exportPath = getExportFileName(path, deckName, includeSched)
 
         if (BackendFactory.defaultLegacySchema) {