diff --git a/src/main.cpp b/src/main.cpp
index 1e77e27..4f32749 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -44,9 +44,10 @@ int main(int argc, char* argv[]) {
             const launch& Policy = not parallel ? launch::deferred : launch::async;
             for (const string_view& fileName: uniqueFiles) {
                 if (fileName != "none") {
-                    Units.push_back(async(Policy, [&fileName, &compile]() {
+                    pair<string, optional<Yerbacon::Exception>> returnedPair;
+                    Units.push_back(async(Policy, [&returnedPair, &fileName, &compile]() {
                         try {
-                            return pair(compile(fileName), optional<Yerbacon::Exception>());
+                            returnedPair.first = compile(fileName);
                         } catch (const Yerbacon::Exception& e) {
                             unsigned long lastSlash = 0;
                             unsigned long position1 = fileName.find_last_of('/');
@@ -60,8 +61,10 @@ int main(int argc, char* argv[]) {
                                   }
                                 #endif
                             }
-                            return pair(string(fileName.substr(lastSlash + 1)), make_optional(e));
+                            returnedPair.first = fileName.substr(lastSlash + 1);
+                            returnedPair.second.emplace(e);
                         }
+                        return move(returnedPair);
                     }));
                 }
             }