diff --git a/client.mak b/client.mak
index 2b45d95bc4b..e5099c576aa 100644
--- a/client.mak
+++ b/client.mak
@@ -20,12 +20,6 @@ DEPTH=.
 MOZ_TOP=mozilla
 !endif
 
-#
-# Arbitrary required defines (should probably just turn them on in the
-#                              tree by default)
-
-MODULAR_NETLIB = 1
-
 #
 # Command macro defines
 #
diff --git a/config/config.mak b/config/config.mak
index de9920e8479..facafff80f4 100644
--- a/config/config.mak
+++ b/config/config.mak
@@ -156,9 +156,8 @@ CFLAGS = $(CFLAGS) -FR
 CFLAGS=$(CFLAGS) -DMOZ_FULLCIRCLE
 !endif
 
-!ifdef MODULAR_NETLIB
-CFLAGS=$(CFLAGS) -DMODULAR_NETLIB -DNS_MT_SUPPORTED -DNETLIB_THREAD -DNS_NET_FILE
-!endif
+# For modular netlib support.
+CFLAGS=$(CFLAGS) -DNS_MT_SUPPORTED -DNETLIB_THREAD -DNS_NET_FILE
 
 # Defines for cookie management feature...
 CFLAGS=$(CFLAGS) -DCookieManagement