diff --git a/ext/crlib/cr-alloc.h b/ext/crlib/cr-alloc.h
index 65b69bf..4fe5b58 100644
--- a/ext/crlib/cr-alloc.h
+++ b/ext/crlib/cr-alloc.h
@@ -34,7 +34,7 @@ public:
 
 public:
    template <typename T> T *allocate (const size_t length = 1) {
-      auto memory = reinterpret_cast <T *> (malloc (cr::max (1u, length * sizeof (T))));
+      auto memory = reinterpret_cast <T *> (malloc (cr::max <size_t> (1u, length * sizeof (T))));
 
       if (!memory) {
          plat.abort ();