diff --git a/mozilla/config/config.mak b/mozilla/config/config.mak
index d7eb5f66ddd..ce2a4cb60b0 100644
--- a/mozilla/config/config.mak
+++ b/mozilla/config/config.mak
@@ -206,6 +206,9 @@ CFLAGS=$(CFLAGS) -DMODULAR_NETLIB -DNS_MT_SUPPORTED -DNETLIB_THREAD -DNS_NET_FIL
 # Defines for cookie management feature...
 CFLAGS=$(CFLAGS) -DCookieManagement
 
+# Defines for new clipboard support
+CFLAGS=$(CFLAGS) -DNEW_CLIPBOARD_SUPPORT
+
 # Defines for single signon and client wallet features...
 !ifndef MOZ_NO_WALLET_HACK
 CFLAGS=$(CFLAGS) -DSingleSignon -DClientWallet