diff --git a/Tests/RunCMake/CMP0194/CMP0194-common.cmake b/Tests/RunCMake/CMP0194/CMP0194-common.cmake
index 47aa914c22..8aabdb724f 100644
--- a/Tests/RunCMake/CMP0194/CMP0194-common.cmake
+++ b/Tests/RunCMake/CMP0194/CMP0194-common.cmake
@@ -1,3 +1,3 @@
 enable_language(C)
-set(ENV{PATH} "")
+unset(ENV{PATH})
 enable_language(ASM)
diff --git a/Tests/RunCMake/FindLua/FindLuaTest.cmake b/Tests/RunCMake/FindLua/FindLuaTest.cmake
index be5e3ab3e1..df3fc56741 100644
--- a/Tests/RunCMake/FindLua/FindLuaTest.cmake
+++ b/Tests/RunCMake/FindLua/FindLuaTest.cmake
@@ -9,8 +9,8 @@ set(ENV{CMAKE_INCLUDE_PATH} )
 set(ENV{CMAKE_PREFIX_PATH} )
 set(ENV{CMAKE_FRAMEWORK_PATH} )
 
-set(ENV{PATH} )
-set(ENV{INCLUDE} )
+unset(ENV{PATH})
+unset(ENV{INCLUDE})
 
 set(CMAKE_SYSTEM_INCLUDE_PATH )
 set(CMAKE_SYSTEM_PREFIX_PATH )