diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0fe939d..e4fc213 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,7 +59,7 @@ endif()
 #
 check_include_file(unistd.h Z_HAVE_UNISTD_H)
 
-if(MSVC)
+if(WIN32)
     set(CMAKE_DEBUG_POSTFIX "d")
     add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
     add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)