diff --git a/src/test/isolation/Makefile b/src/test/isolation/Makefile
index ae04f6cc1a2de094ae0c81c3e6c65dfe0af92a03..82ce248a07e16186534e2cfca0091ab64feab6e0 100644
--- a/src/test/isolation/Makefile
+++ b/src/test/isolation/Makefile
@@ -68,7 +68,7 @@ maintainer-clean: distclean
 	rm -f specparse.c specscanner.c
 
 installcheck: all
-	./pg_isolation_regress --schedule=$(srcdir)/isolation_schedule
+	./pg_isolation_regress --inputdir=$(srcdir) --schedule=$(srcdir)/isolation_schedule
 
 check: all
-	./pg_isolation_regress --temp-install=./tmp_check --top-builddir=$(top_builddir) --schedule=$(srcdir)/isolation_schedule
+	./pg_isolation_regress --temp-install=./tmp_check --inputdir=$(srcdir) --top-builddir=$(top_builddir) --schedule=$(srcdir)/isolation_schedule
diff --git a/src/test/isolation/README b/src/test/isolation/README
index f6984b0beec7b8f4e5ab5de9066af3c1f0c9f947..ee94081f09a7eda920a81d81b1d6bba964480c71 100644
--- a/src/test/isolation/README
+++ b/src/test/isolation/README
@@ -26,7 +26,7 @@ Test specification
 ==================
 
 Each isolation test is defined by a specification file, stored in the specs
-subdirectory. A test specification consists of five parts, in this order:
+subdirectory. A test specification consists of four parts, in this order:
 
 setup { <SQL> }