diff --git a/source/scenarios/aging.cpp b/source/scenarios/aging.cpp
index 41c8d06..cb41434 100644
--- a/source/scenarios/aging.cpp
+++ b/source/scenarios/aging.cpp
@@ -365,7 +365,7 @@ void AgingScenario::run() {
 
 #elif __linux__ || __unix__ || defined(_POSIX_VERSION)
           if (new_file_size > actual_file_size) {  // Only expand, never shrink
-            if (fallocate(fd, 0, actual_file_size, new_file_size - actual_file_size) == -1) {
+            if (fallocate(fd, 0, actual_file_size, new_file_size.get_value() - actual_file_size) == -1) {
               perror("fallocate");
               throw std::runtime_error("fallocate failed for file: " + random_file_path);
             }