diff --git a/include/ircd/m/room/messages.h b/include/ircd/m/room/messages.h
index d8ec10dd6..bbccdeea7 100644
--- a/include/ircd/m/room/messages.h
+++ b/include/ircd/m/room/messages.h
@@ -25,7 +25,7 @@ namespace ircd::m
 	// have been obtained at that depth. Each gap is reported to the closure
 	// with a separate invocation. The range is [inclusive, exclusive].
 	using depth_range = std::pair<int64_t, int64_t>;
-	using depth_range_closure = std::function<bool (const depth_range &)>;
+	using depth_range_closure = std::function<bool (const depth_range &, const event::idx &)>;
 	bool for_each_depth_gap(const room &, const depth_range_closure &);
 	bool rfor_each_depth_gap(const room &, const depth_range_closure &);
 	std::pair<bool, int64_t> is_complete(const room &);
diff --git a/modules/console.cc b/modules/console.cc
index e9ebba9b8..4bc5c9e8c 100644
--- a/modules/console.cc
+++ b/modules/console.cc
@@ -7436,7 +7436,7 @@ console_cmd__room__depth__gaps(opt &out, const string_view &line)
 	};
 
 	const auto closure{[&out]
-	(const auto &range)
+	(const auto &range, const auto &event_idx)
 	{
 		out << std::right << std::setw(8) << range.first
 		    << " : "
diff --git a/modules/m_room.cc b/modules/m_room.cc
index 709eacc36..765e59b6b 100644
--- a/modules/m_room.cc
+++ b/modules/m_room.cc
@@ -519,7 +519,7 @@ ircd::m::rfor_each_depth_gap(const room &room,
 		if(range.first == range.second)
 			continue;
 
-		if(!closure({range.first+1, range.second+1}))
+		if(!closure({range.first+1, range.second+1}, it.event_idx()))
 			return false;
 
 		range.second = range.first;
@@ -548,7 +548,7 @@ ircd::m::for_each_depth_gap(const room &room,
 		if(range.first == range.second)
 			continue;
 
-		if(!closure(range))
+		if(!closure(range, it.event_idx()))
 			return false;
 
 		range.first = range.second;