diff --git a/CMake/Dependencies.cmake b/CMake/Dependencies.cmake
index 6426d1338..47160fe50 100644
--- a/CMake/Dependencies.cmake
+++ b/CMake/Dependencies.cmake
@@ -169,6 +169,10 @@ if(BUILD_TESTING)
   if(DEVILUTIONX_SYSTEM_GOOGLETEST)
     find_package(GTest REQUIRED)
     if(NOT TARGET GTest::gtest)
+      if(CMAKE_VERSION VERSION_LESS "3.18")
+        # Aliasing local targets is not supported on CMake < 3.18, so make it global.
+        set_target_properties(GTest::GTest PROPERTIES IMPORTED_GLOBAL TRUE)
+      endif()
       add_library(GTest::gtest ALIAS GTest::GTest)
     endif()
   else()