diff --git a/CMakeLists.txt b/CMakeLists.txt
index 80a3838..dbe0efb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.15)
 project(tinyxml2 VERSION 10.0.0)
 
-if(DEFINED CMAKE_TOOLCHAIN_FILE)
+if(NOT "${CMAKE_TOOLCHAIN_FILE}" STREQUAL "")
     MESSAGE(STATUS "Using toolchain file: ${CMAKE_TOOLCHAIN_FILE}")
 endif()