diff --git a/src/interfaces/ecpg/test/Makefile.regress b/src/interfaces/ecpg/test/Makefile.regress
index b3d7c1e..7bc67a0 100644
--- a/src/interfaces/ecpg/test/Makefile.regress
+++ b/src/interfaces/ecpg/test/Makefile.regress
@@ -20,7 +20,7 @@ ECPG_TEST_DEPENDENCIES = ../../preproc/ecpg$(X) \
 	$(srcdir)/../../include/sql3types.h
 
 %: %.o
-	$(CC) $(CFLAGS) $< $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@
+	$(CC) $(CFLAGS) $< $(libpq_pgport) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@
 
 # Caution: this build rule is overridden in some child Makefiles
 # where it's necessary to use nondefault switches to ecpg;