diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Regexes.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Regexes.kt
index ca88823d..633370f5 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Regexes.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Regexes.kt
@@ -127,7 +127,7 @@ object Regexes {
 
 
     val LIBRUS_ATTACHMENT_KEY by lazy {
-        """singleUseKey=([0-9A-f_]+)""".toRegex()
+        """singleUseKey=([0-9A-z_]+)""".toRegex()
     }