diff --git a/CMakeLists.txt b/CMakeLists.txt
index f84c4bd8568..273b9b96762 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -96,7 +96,7 @@ if (CMAKE_SYSTEM_NAME MATCHES "CYGWIN")
    endif()
 endif()
 
-if (CMAKE_SYSTEM_NAME MATCHES "WINDOWS")
+if (CMAKE_SYSTEM_NAME MATCHES "Windows")
    if ((CMAKE_GENERATOR MATCHES "MinGW Makefiles") OR
        (CMAKE_GENERATOR MATCHES "MSYS Makefiles") OR
        (CMAKE_GENERATOR MATCHES "Unix Makefiles"))