diff --git a/src/c/ffi/libraries.d b/src/c/ffi/libraries.d
index 9973ae457..098cd483d 100644
--- a/src/c/ffi/libraries.d
+++ b/src/c/ffi/libraries.d
@@ -44,9 +44,6 @@
 # ifdef HAVE_DLFCN_H
 #  include <dlfcn.h>
 #  define INIT_PREFIX "init_fas_"
-#  ifdef bool
-#   undef bool
-#  endif
 # endif
 # ifdef HAVE_MACH_O_DYLD_H
 #  include <mach-o/dyld.h>