diff --git a/MCServer/Plugins/TestLuaRocks/TestLuaRocks.lua b/MCServer/Plugins/TestLuaRocks/TestLuaRocks.lua
index 6e90b1ae9..4a7cd4e1e 100644
--- a/MCServer/Plugins/TestLuaRocks/TestLuaRocks.lua
+++ b/MCServer/Plugins/TestLuaRocks/TestLuaRocks.lua
@@ -27,7 +27,7 @@ LOG("headers: ");
 for k, v in pairs(headers or {}) do
 	LOG("  " .. k .. ": " .. v);
 end
-LOG("body length: " .. string.length(body));
+LOG("body length: " .. string.len(body));
 
 
 
diff --git a/lib/lua/CMakeLists.txt b/lib/lua/CMakeLists.txt
index b4b5b5f1d..af03f4b1a 100644
--- a/lib/lua/CMakeLists.txt
+++ b/lib/lua/CMakeLists.txt
@@ -25,6 +25,11 @@ else()
 	add_library(lua ${SOURCE})
 endif()
 
+# Tell Lua what dynamic loader to use (for LuaRocks):
+if (UNIX)
+	add_definitions(-DLUA_USE_DLOPEN)
+endif()
+
 if (UNIX)
 	target_link_libraries(lua m ${DYNAMIC_LOADER})
 endif()