diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 5bac7090..c4168e3a 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -483,7 +483,7 @@ set_tests_properties("ErrorHandling::InvalidTestSpecExitsEarly"
     FAIL_REGULAR_EXPRESSION "No tests ran"
 )
 
-if(MSVC)
+if(WIN32)
   set(_NullFile "NUL")
 else()
   set(_NullFile "/dev/null")
diff --git a/tests/ExtraTests/CMakeLists.txt b/tests/ExtraTests/CMakeLists.txt
index efa83750..7e761931 100644
--- a/tests/ExtraTests/CMakeLists.txt
+++ b/tests/ExtraTests/CMakeLists.txt
@@ -273,7 +273,7 @@ set_tests_properties(Reporters::CapturedStdOutInEvents
     FAIL_REGULAR_EXPRESSION "X27 ERROR"
 )
 
-if(MSVC)
+if(WIN32)
   set(_NullFile "NUL")
 else()
   set(_NullFile "/dev/null")