diff --git a/prospero/Makefile b/prospero/Makefile
index ca68745..def6694 100755
--- a/prospero/Makefile
+++ b/prospero/Makefile
@@ -8,7 +8,6 @@
 # This is the top level Makefile for the Prospero Directory Service.
 
 # Include configuration options.
-PROSPERO_ROOT = $(PROSPERO_ROOT)
 include Makefile.config
 
 # Programs that live in subdirectories, and have makefiles of their own.