diff --git a/src/util/pool_allocator.cpp b/src/util/pool_allocator.cpp
new file mode 100644
index 000000000..5a4cd5b70
--- /dev/null
+++ b/src/util/pool_allocator.cpp
@@ -0,0 +1,7 @@
+#include "util/pool_allocator.hpp"
+
+namespace osrm::util
+{
+     std::vector<void*> Cleanup::allocated_blocks_;
+        std::mutex Cleanup::mutex_;
+} // namespace osrm::util
\ No newline at end of file