pyside-tools installs man pages on windows

diff --git a/CMakeLists.txt b/CMakeLists.txt
index af33d0f..a077459 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,7 +53,7 @@ install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/pyside2uic
         PATTERN "*pyside2uic\\__init__.py" EXCLUDE)
 
 # Man pages for pyside2-uic
-if (NOT win32)
+if (NOT WIN32)
     file(GLOB manpages "${CMAKE_CURRENT_SOURCE_DIR}/pyside2uic/*.1")
     install(FILES ${manpages} DESTINATION share/man/man1)
 endif()
diff --git a/pylupdate/CMakeLists.txt b/pylupdate/CMakeLists.txt
index 83e5bf0..a46608c 100644
--- a/pylupdate/CMakeLists.txt
+++ b/pylupdate/CMakeLists.txt
@@ -38,7 +38,7 @@ target_link_libraries(pyside2-lupdate
 install(TARGETS pyside2-lupdate RUNTIME DESTINATION bin)
 
 # Man pages
-if (NOT win32)
+if (NOT WIN32)
     file(GLOB manpages "${CMAKE_CURRENT_SOURCE_DIR}/*.1")
     install(FILES ${manpages} DESTINATION share/man/man1)
 endif()
diff --git a/pyrcc/CMakeLists.txt b/pyrcc/CMakeLists.txt
index b486e32..2aaf788 100644
--- a/pyrcc/CMakeLists.txt
+++ b/pyrcc/CMakeLists.txt
@@ -12,7 +12,7 @@ target_link_libraries(pyside2-rcc
 install(TARGETS pyside2-rcc RUNTIME DESTINATION bin)
 
 # Man pages
-if (NOT win32)
+if (NOT WIN32)
     file(GLOB manpages "${CMAKE_CURRENT_SOURCE_DIR}/*.1")
     install(FILES ${manpages} DESTINATION share/man/man1)
 endif()