diff --git a/support-lib/wasm/Future_wasm.hpp b/support-lib/wasm/Future_wasm.hpp
index ac501289..8b70a864 100644
--- a/support-lib/wasm/Future_wasm.hpp
+++ b/support-lib/wasm/Future_wasm.hpp
@@ -96,6 +96,7 @@ class FutureAdaptor
         void doResolve() {
             try {
                 if constexpr (std::is_void_v<typename RESULT::CppType>) {
+                    _future->get();
                     _resolveFunc(em::val::undefined());
                 } else {
                     _resolveFunc(RESULT::Boxed::fromCpp(_future->get()));