diff --git a/CMakeLists.txt b/CMakeLists.txt
index 529b2730..78db01e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -176,7 +176,7 @@ find_package(Boost 1.62 REQUIRED COMPONENTS
 		program_options
 		locale)
 
-if(LINUX)
+if(UNIX AND NOT APPLE)
     find_package(X11 REQUIRED)
     message(STATUS "X11_FOUND = ${X11_FOUND}")
     message(STATUS "X11_INCLUDE_DIR = ${X11_INCLUDE_DIR}")