diff --git a/mk/config.mk.in b/mk/config.mk.in
index 934183e9f633892878c8f633f633d8dcdad4d8df..387030a03637ac2170a621acd0af1442c9c5d29c 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -213,9 +213,6 @@ GhcWithRegisterised=YES
 #   i386, alpha & sparc
 GhcWithNativeCodeGen=$(shell if (test x$(findstring $(HostArch_CPP),i386 alpha sparc) = x); then echo NO; else echo YES; fi)
 
-# Build the compiler with the deforester included?
-GhcWithDeforester=NO
-
 #
 # Building various ways?
 # (right now, empty if not).