diff --git a/modules/mesh-delivery-checker/internal/check/pins.go b/modules/mesh-delivery-checker/internal/check/pins.go
index 1ec0015d..60eed5a1 100644
--- a/modules/mesh-delivery-checker/internal/check/pins.go
+++ b/modules/mesh-delivery-checker/internal/check/pins.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"maps"
+	"strings"
 
 	"git.novox.be/novox/mesh-delivery/sdk/buildstep"
 	"git.novox.be/novox/mesh-delivery/sdk/trunk"
@@ -66,6 +67,28 @@ func (st *state) packagesOf(repository string) buildstep.PackageVersions {
 			delete(versions, pkg)
 		}
 	}
+	// A package of a member that no indexer state publishes yet (a repository whose packages are all new) is in no list above,
+	// and the build would look for it as the trunk's latest version, which does not exist (issue 1921). The member's root
+	// module path stands for its repository: the build module takes the head of a repository from any package of it.
+	for _, m := range st.c.Pulls {
+		if trunk.SameRepository(m.Repository, repository) || len(m.Head) != 40 {
+			continue
+		}
+		name := strings.TrimPrefix(m.Repository, "novox/")
+		if m.Repository == name {
+			continue
+		}
+		held := false
+		for pkg := range versions {
+			if repo, _, ok := trunk.PackageRepository(pkg); ok && repo == m.Repository {
+				held = true
+				break
+			}
+		}
+		if !held {
+			versions[trunk.ForgeModulePrefix+name] = m.Head
+		}
+	}
 	if len(versions) == 0 {
 		return nil
 	}
diff --git a/modules/mesh-delivery-checker/internal/check/pins_test.go b/modules/mesh-delivery-checker/internal/check/pins_test.go
index e1871604..75f9fc23 100644
--- a/modules/mesh-delivery-checker/internal/check/pins_test.go
+++ b/modules/mesh-delivery-checker/internal/check/pins_test.go
@@ -68,6 +68,15 @@ func TestAGroupMemberIsBuiltAgainstTheSDKMembersHeadWhateverItsGoModNames(t *tes
 	if got := packagesOfFetch(t, b, "novox/mesh-catalog"); len(got) != 2 || got[SDKModulePath] != trunkS || got[contract] != trunkA {
 		t.Errorf("a pull request alone is built against %v, want every package at its latest published version", got)
 	}
+	// A member that publishes no package yet is still named, by its root module path, at its head (issue 1921).
+	b = newBench(t)
+	b.ex.Published = published{}
+	if v := b.judge(t, caseOf(t, pullOf(repoA, 7, head1), pullOf("novox/mesh-host", 8, head2))).Verdict; v.State != meshdeliverycheckerclient.VerdictPass {
+		t.Fatalf("an unpublished member: verdict = %+v", v)
+	}
+	if got := packagesOfFetch(t, b, repoA); len(got) != 1 || got["git.novox.be/novox/mesh-host"] != head2 {
+		t.Errorf("the member's packages = %v, want the unpublished member's root at its head %s alone", got, head2)
+	}
 
 	// Design 51 *Tagged versions* (DLV-C3): a group's check says tag-wanted for each package a member declares and builds no
 	// member before its published; a lone pull request asks nothing; no published within the bound fails naming the package.