diff --git a/limmutable.c b/limmutable.c
index e3e3034..959695e 100644
--- a/limmutable.c
+++ b/limmutable.c
@@ -70,8 +70,12 @@ static int Lcreate_instance(lua_State *L)
                 item_hash = 0x97167da9;
                 break;
             case LUA_TNUMBER:
-                item_hash = (lua_Integer)lua_tonumber(L, -1);
-                break;
+                {
+                    // Cast float bits to integer
+                    lua_Number n = lua_tonumber(L, -1);
+                    item_hash = *((lua_Integer*)&n);
+                    break;
+                }
             case LUA_TBOOLEAN:
                 // Arbitrarily chosen values
                 item_hash = lua_toboolean(L, -1)? 0x82684f71 : 0x88d66f2a;