diff --git a/include/runtime/arena.h b/include/runtime/arena.h
index 4bb5ac315..afbfca21b 100644
--- a/include/runtime/arena.h
+++ b/include/runtime/arena.h
@@ -4,6 +4,7 @@
 #include <algorithm>
 #include <cstddef>
 #include <cstdint>
+#include <sys/mman.h>
 #include <sys/types.h>
 #include <utility>
 
@@ -22,6 +23,12 @@ class arena {
     initialize_semispace();
   }
 
+  ~arena() {
+    munmap(current_addr_ptr, HYPERBLOCK_SIZE);
+    if (collection_addr_ptr)
+      munmap(collection_addr_ptr, HYPERBLOCK_SIZE);
+  }
+
   char *evacuate(char *scan_ptr);
 
   // Allocates the requested number of bytes as a contiguous region and returns a