diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 7523e59e14..0fc6b041bb 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -7,7 +7,7 @@
 #
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/interfaces/libpq/Makefile,v 1.7 1996/09/25 19:37:31 momjian Exp $
+#    $Header: /cvsroot/pgsql/src/interfaces/libpq/Makefile,v 1.8 1996/10/25 09:22:30 bryanh Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -19,6 +19,8 @@ CFLAGS+= -I../backend/include \
 	-I../backend \
 	-I. \
 
+CFLAGS+= -DPOSTPORT='"$(POSTPORT)"'
+
 ifdef KRBVERS
 CFLAGS+= $(KRBFLAGS)
 endif