diff --git a/include/cppcoro/detail/when_all_task.hpp b/include/cppcoro/detail/when_all_task.hpp
index abaff33b..3837778a 100644
--- a/include/cppcoro/detail/when_all_task.hpp
+++ b/include/cppcoro/detail/when_all_task.hpp
@@ -12,6 +12,7 @@
 
 #include <experimental/coroutine>
 #include <cassert>
+#include <exception>
 
 namespace cppcoro
 {