diff --git a/matrix/room_bootstrap.cc b/matrix/room_bootstrap.cc
index a9486f9c8..9fd8d27ab 100644
--- a/matrix/room_bootstrap.cc
+++ b/matrix/room_bootstrap.cc
@@ -153,7 +153,7 @@ try
 
 	static const auto stack_sz
 	{
-		128_KiB
+		256_KiB
 	};
 
 	const m::event::fetch event