diff --git a/src/interfaces/ecpg/pgtypeslib/Makefile b/src/interfaces/ecpg/pgtypeslib/Makefile
index 530b580d7c..ae79ead7a7 100644
--- a/src/interfaces/ecpg/pgtypeslib/Makefile
+++ b/src/interfaces/ecpg/pgtypeslib/Makefile
@@ -24,6 +24,7 @@ override CFLAGS += $(PTHREAD_CFLAGS)
 
 SHLIB_LINK_INTERNAL = -lpgcommon_shlib -lpgport_shlib
 SHLIB_LINK += $(filter -lintl -lm, $(LIBS))
+SHLIB_PREREQS = submake-libpgport
 
 SHLIB_EXPORTS = exports.txt
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index a06882651f..d4919970f8 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -85,13 +85,12 @@ endif
 ifeq ($(PORTNAME), win32)
 SHLIB_LINK += -lshell32 -lws2_32 -lsecur32 $(filter -leay32 -lssleay32 -lcomerr32 -lkrb5_32, $(LIBS))
 endif
+SHLIB_PREREQS = submake-libpgport
 
 SHLIB_EXPORTS = exports.txt
 
 all: all-lib
 
-all-lib: | submake-libpgport
-
 # Shared library stuff
 include $(top_srcdir)/src/Makefile.shlib
 backend_src = $(top_srcdir)/src/backend