diff --git a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
index cc2c5604815fa95bf03b67fe6e5543b3c1301c4a..caceddb2e0f24e802fc90c9bfbf56171a8ca2bdd 100644
--- a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
+++ b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
@@ -1036,7 +1036,7 @@ public class FileBackend {
     }
 
     public Cid[] calculateCids(final Uri uri) throws IOException {
-        return calculateCids(mXmppConnectionService.getContentResolver().openInputStream(uri));
+        return calculateCids(openInputStream(uri));
     }
 
     public Cid[] calculateCids(final InputStream is) throws IOException {