diff --git a/go/catalogue/checker_seat.go b/go/catalogue/checker_seat.go
index 7426d2c..e9a5821 100644
--- a/go/catalogue/checker_seat.go
+++ b/go/catalogue/checker_seat.go
@@ -23,7 +23,7 @@ func checkerVerbs() []Verb {
 				"tests": "a go test -run pattern: only those tests run, and nothing is kept",
 				"level": "unit or integration: only this level; both when absent"},
 				[]string{"repository", "head"}),
-			Replaces: []string{"sh merge-check.sh"}},
+			Replaces: []string{"sh merge-check.sh", "docker run postgres"}},
 		{Name: "try-read", Optional: true, Description: "Where a try stands, as stored: queued, running, or its end " +
 			"(pass, fail, or error when it could not run), with what was said of it, the head and the trunk commit " +
 			"it was merged onto, the time it took and what failed first. Read-only.",
diff --git a/go/catalogue/seats_test.go b/go/catalogue/seats_test.go
index 137cc98..e8b5a51 100644
--- a/go/catalogue/seats_test.go
+++ b/go/catalogue/seats_test.go
@@ -49,7 +49,7 @@ func TestTheSeatsAreAClosedSetAndEachNamesItsDecision(t *testing.T) {
 		if s.Name == CheckerSeat {
 			for _, v := range s.Serves {
 				checkerVerbs = append(checkerVerbs, v.Name)
-				if v.Name == "try" && strings.Join(v.Replaces, "|") != "sh merge-check.sh" {
+				if v.Name == "try" && strings.Join(v.Replaces, "|") != "sh merge-check.sh|docker run postgres" {
 					t.Errorf("try replaces %v", v.Replaces)
 				}
 			}