diff --git a/DynamicLoader.cxx b/DynamicLoader.cxx
index 4e0531b304d57b06b035e0a2c1481efef89525c5..a98f94b95cbc4dcfae824df10aee379829794afa 100644
--- a/DynamicLoader.cxx
+++ b/DynamicLoader.cxx
@@ -144,7 +144,7 @@ LibHandle DynamicLoader::OpenLibrary(const char* libname )
 //----------------------------------------------------------------------------
 int DynamicLoader::CloseLibrary( LibHandle lib)
 {
-  DYLD_BOOL success = NSUnLinkModule(lib, NSUNLINKMODULE_OPTION_NONE);
+  bool success = NSUnLinkModule(lib, NSUNLINKMODULE_OPTION_NONE);
   return success;
 }