diff --git a/Source/util.cpp b/Source/util.cpp
index 25e515e6..c3db2e08 100644
--- a/Source/util.cpp
+++ b/Source/util.cpp
@@ -33,6 +33,7 @@
 
 #ifdef __APPLE__
 namespace Apple { // defines struct section
+#  define ENUM_DYLD_BOOL // for TRUE/FALSE, bug #1851365
 #  include <mach-o/dyld.h> // for _NSGetExecutablePath
 };
 #  include <sys/param.h> // for MAXPATHLEN