diff --git a/CMakeLists.txt b/CMakeLists.txt
index ffb1db3dc..a82ed8619 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -273,7 +273,7 @@ install(
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
 )
 
-if (UNIX OR MINGW OR CYGWIN)
+if (1)
     SET(prefix ${CMAKE_INSTALL_PREFIX})
     # exec_prefix is prefix by default and CMake does not have the
     # concept.