diff --git a/debian/libnotmuch1.symbols b/debian/libnotmuch1.symbols
index f30f48b1..713f78c2 100644
--- a/debian/libnotmuch1.symbols
+++ b/debian/libnotmuch1.symbols
@@ -1,4 +1,8 @@
 libnotmuch.so.1 libnotmuch1 #MINVER#
+ _Z32_notmuch_message_ensure_metadataP16_notmuch_message@Base 0.6~171
+ _ZN6Xapian20InvalidArgumentErrorC1ERKS0_@Base 0.6~171
+ _ZN6Xapian20InvalidArgumentErrorC2ERKS0_@Base 0.6~171
+ _ZN6Xapian20InvalidArgumentErrorD1Ev@Base 0.6~171
  _ZTIN6Xapian10LogicErrorE@Base 0.3
  _ZTIN6Xapian12RuntimeErrorE@Base 0.3
  _ZTIN6Xapian16DocNotFoundErrorE@Base 0.3