diff --git a/src/p_mach.cpp b/src/p_mach.cpp
index 7ad7c5a0..17040408 100644
--- a/src/p_mach.cpp
+++ b/src/p_mach.cpp
@@ -1167,7 +1167,7 @@ void PackMachBase<T>::pack1(OutputFile *const fo, Filter &/*ft*/)  // generate e
             + sizeof(segXHDR) + sizeof(secXHDR)
             + sizeof(segTEXT) + sizeof(secTEXT) + sizeof(segLINK) +
             my_thread_command_size /* + sizeof(uuid_cmd) + sizeof(linkitem) */ ;
-        mhdro.flags = Mach_header::MH_NOUNDEFS;
+        mhdro.flags = Mach_header::MH_NOUNDEFS | Mach_header::MH_DYLDLINK;
     }
     fo->write(&mhdro, sizeof(mhdro));
 
diff --git a/src/p_mach_enum.h b/src/p_mach_enum.h
index 5ec1dbeb..2ef6e070 100644
--- a/src/p_mach_enum.h
+++ b/src/p_mach_enum.h
@@ -56,7 +56,8 @@
         MH_BUNDLE  = 8      /* dynamically bound bundle file */
     };
     enum { // flags
-        MH_NOUNDEFS = 1
+        MH_NOUNDEFS = 1,
+        MH_DYLDLINK = 4     /* code signing demands this */
     };
 #endif  /*}*/