diff --git a/CMakeLists.txt b/CMakeLists.txt
index bf9ebb21a..6ee036128 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -181,7 +181,7 @@ CHECK_INCLUDE_FILE_CXX(sys/eventfd.h HAVE_SYS_EVENTFD_H)
 CHECK_INCLUDE_FILE_CXX(sys/file.h HAVE_SYS_FILE_H)
 CHECK_INCLUDE_FILES_CXX("X11/Xlib.h;X11/extensions/Xrandr.h" HAVE_X11_EXTENSIONS_XRANDR_H)
 CHECK_INCLUDE_FILES_CXX("X11/Xlib.h;X11/keysym.h" HAVE_X11_KEYSYM_H)
-CHECK_CXX_SOURCE_COMPILES("include <getopt.h>\nint main(int argc, char * argv[]) { getopt_long(argc, argv, \"\", 0, 0); }" HAVE_GETOPT_H)
+CHECK_CXX_SOURCE_COMPILES("#include <getopt.h>\nint main(int argc, char * argv[]) { getopt_long(argc, argv, \"\", 0, 0); }" HAVE_GETOPT_H)
 
 ############################################################################
 # Locate libraries