Index: library/serialize/serializer.tcl
===================================================================
diff -u -re55834dbcc53f6cd46dd3e03240da1f3bd7b4a9b -rf9488b47a7d554eea7a9f7ac820e339f312ca4a3
--- library/serialize/serializer.tcl	(.../serializer.tcl)	(revision e55834dbcc53f6cd46dd3e03240da1f3bd7b4a9b)
+++ library/serialize/serializer.tcl	(.../serializer.tcl)	(revision f9488b47a7d554eea7a9f7ac820e339f312ca4a3)
@@ -743,6 +743,11 @@
 	::nx::configure defaultMethodCallProtection [::nx::configure defaultMethodCallProtection]
 	::nx::configure defaultAccessor [::nx::configure defaultAccessor]
       }]
+      foreach pkg {nx::mongo} {
+	if {![catch {package present $pkg}]} {
+	  append intro "package require $pkg\n"
+	}
+      }
       if {[info command ::Object] ne "" && [namespace origin ::Object] eq "::nx::Object"} {
         append intro "\n" "namespace import -force ::nx::*"
       }