diff --git a/checks/locks/main.go b/checks/locks/main.go
index e0b5c5829..fb9c6b651 100644
--- a/checks/locks/main.go
+++ b/checks/locks/main.go
@@ -5,7 +5,8 @@
 //	go run . <catalogue root>
 //
 // Exits 1 on a finding. The packages that count are those the build module counts (mesh-build-node fetch.go
-// ownDependencies): the `dependencies` beyond the SDK, typescript and the @types packages.
+// ownDependencies): the `dependencies` beyond the mesh's own packages (@novox/mesh-*, the SDK among them), typescript and the
+// @types packages.
 package main
 
 import (
@@ -17,6 +18,10 @@ import (
 	"strings"
 )
 
+// meshPackages is the prefix of every package the mesh itself publishes: the build module's toolchain and the mesh's registry
+// give them, as they give the SDK, so a module naming only them needs no lock (design 47 G A-56).
+const meshPackages = "@novox/mesh-"
+
 // Finding is one module refused: it names Packages beyond the SDK and has no lock file.
 type Finding struct {
 	Module   string
@@ -70,7 +75,7 @@ func Check(root string) ([]Finding, error) {
 		}
 		var names []string
 		for n := range pkg.Dependencies {
-			if n != "@novox/mesh-sdk" && n != "typescript" && !strings.HasPrefix(n, "@types/") {
+			if !strings.HasPrefix(n, meshPackages) && n != "typescript" && !strings.HasPrefix(n, "@types/") {
 				names = append(names, n)
 			}
 		}
diff --git a/checks/locks/main_test.go b/checks/locks/main_test.go
index 11aab626d..6ab888974 100644
--- a/checks/locks/main_test.go
+++ b/checks/locks/main_test.go
@@ -35,6 +35,8 @@ func TestAModuleNamingOnlyTheSDKNeedsNoLock(t *testing.T) {
 	root := t.TempDir()
 	module(t, root, "plain", "typescript", sdkOnly, false)
 	module(t, root, "none", "typescript", "", false)
+	// The mesh's own packages count as the SDK does (design 47 G A-56): a contracts package needs no lock.
+	module(t, root, "contracts", "typescript", `{"dependencies":{"@novox/mesh-sdk":"^0.1.1","@novox/mesh-delivery-contracts-git":"^0.1.0"}}`, false)
 	got, err := Check(root)
 	if err != nil || len(got) != 0 {
 		t.Fatalf("%v %v", got, err)