diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java
index b1f1a7d9e..cbb243fad 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/TemporaryStorageProvider.java
@@ -180,7 +180,7 @@ public class TemporaryStorageProvider extends ContentProvider {
                 cursor.close();
             }
         }
-        return "*/*";
+        return "application/octet-stream";
     }
 
     @Override