diff --git a/nomad/job_endpoint_oss.go b/nomad/job_endpoint_oss.go
index e234844293a8..96c30a750d63 100644
--- a/nomad/job_endpoint_oss.go
+++ b/nomad/job_endpoint_oss.go
@@ -3,6 +3,7 @@
 package nomad
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
@@ -10,6 +11,9 @@ import (
 	vapi "github.com/hashicorp/vault/api"
 )
 
+// ErrMultipleNamespaces is send when multiple namespaces are used in the OSS setup
+var ErrMultipleNamespaces = errors.New("multiple vault namespaces requires Nomad Enterprise")
+
 // enforceSubmitJob is used to check any Sentinel policies for the submit-job scope
 func (j *Job) enforceSubmitJob(override bool, job *structs.Job) (error, error) {
 	return nil, nil
@@ -51,7 +55,7 @@ func (j *Job) multiVaultNamespaceValidation(
 ) error {
 	requestedNamespaces := structs.VaultNamespaceSet(policies)
 	if len(requestedNamespaces) > 0 {
-		return fmt.Errorf("multiple vault namespaces requires Nomad Enterprise, Namespaces: %s", strings.Join(requestedNamespaces, ", "))
+		return fmt.Errorf("%w, Namespaces: %s", ErrMultipleNamespaces, strings.Join(requestedNamespaces, ", "))
 	}
 	return nil
 }
diff --git a/nomad/job_endpoint_test.go b/nomad/job_endpoint_test.go
index 970a35b38992..7ff57ccd06cc 100644
--- a/nomad/job_endpoint_test.go
+++ b/nomad/job_endpoint_test.go
@@ -1736,8 +1736,9 @@ func TestJobEndpoint_Register_Vault_MultiNamespaces(t *testing.T) {
 	var resp structs.JobRegisterResponse
 	err := msgpackrpc.CallWithCodec(codec, "Job.Register", req, &resp)
 	// OSS or Ent check
-	if s1.EnterpriseState.Features() == 0 {
-		require.Contains(t, err.Error(), "multiple vault namespaces requires Nomad Enterprise")
+	if err != nil && s1.EnterpriseState.Features() == 0 {
+		// errors.Is cannot be used because the RPC call break error wrapping.
+		require.Contains(t, err.Error(), ErrMultipleNamespaces.Error())
 	} else {
 		require.NoError(t, err)
 	}