diff --git a/test/pool.cpp b/test/pool.cpp
index 56b14cef..b972edf3 100644
--- a/test/pool.cpp
+++ b/test/pool.cpp
@@ -51,13 +51,13 @@ void
 check_keep_value (cruft::TAP::logger &tap)
 {
     // Ensure that items keep their values.
-    cruft::pool<uint64_t> uintpool(256);
-    std::vector<uint64_t*> uintvector;
+    cruft::pool<std::size_t> uintpool(256);
+    std::vector<std::size_t*> uintvector;
     uintvector.reserve(uintpool.capacity ());
 
     // Give every item a unique value
-    for (unsigned int i = 0; i < uintpool.capacity (); ++i) {
-        uint64_t *item = uintpool.allocate ();
+    for (std::size_t i = 0; i < uintpool.capacity (); ++i) {
+        std::size_t *item = uintpool.allocate ();
         *item = i;
 
         uintvector.push_back(item);