1 files changed, 3 insertions, 3 deletions

diff --git a/src/uniquekey.h b/src/uniquekey.h
index bd3b61f..e592f0a 100644
--- a/src/uniquekey.h
+++ b/src/uniquekey.h
@@ -13,11 +13,11 @@ class UniqueKey
 
     public:
 
-    constexpr UniqueKey(uintptr_t val_)
+    constexpr UniqueKey(uint64_t val_)
 #if LUAJIT_FLAVOR() == 64 // building against LuaJIT headers for 64 bits, light userdata is restricted to 47 significant bits, because LuaJIT uses the other bits for internal optimizations
-    : m_storage{ val_ & 0x7fffffffffffull }
+    : m_storage{ static_cast<uintptr_t>(val_ & 0x7fffffffffffull) }
 #else // LUAJIT_FLAVOR()
-    : m_storage{ val_ }
+    : m_storage{ static_cast<uintptr_t>(val_) }
 #endif // LUAJIT_FLAVOR()
     {
     }