diff --git a/index_test.go b/index_test.go
index 3ff2111..0f84197 100644
--- a/index_test.go
+++ b/index_test.go
@@ -20,7 +20,6 @@
 	"fmt"
 	"reflect"
 	"regexp/syntax"
-	"strconv"
 	"strings"
 	"testing"
 
@@ -1261,72 +1260,6 @@
 	}
 }
 
-func TestNewIndexBuilder(t *testing.T) {
-	var branchX100 []RepositoryBranch
-	for i := 0; i < 100; i++ {
-		branchX100 = append(branchX100, RepositoryBranch{
-			Name: strconv.Itoa(i),
-		})
-	}
-
-	cases := []struct {
-		name string
-		repo Repository
-		errS string
-	}{{
-		name: "empty",
-		repo: Repository{},
-	}, {
-		name: "too-many-branches",
-		repo: Repository{
-			Branches: branchX100,
-		},
-		errS: "too many branches",
-	}, {
-		name: "subrepo-branches",
-		repo: Repository{
-			Branches: []RepositoryBranch{{
-				Name: "dev",
-			}},
-			SubRepoMap: map[string]*Repository{
-				"sub": {
-					Branches: []RepositoryBranch{{
-						Name: "dev",
-					}},
-				},
-			},
-		},
-	}, {
-		name: "subrepo-mismatch-branches",
-		repo: Repository{
-			Branches: []RepositoryBranch{{
-				Name: "dev",
-			}},
-			SubRepoMap: map[string]*Repository{
-				"sub": {
-					Branches: []RepositoryBranch{{
-						Name: "main",
-					}},
-				},
-			},
-		},
-		errS: "got subrepository branches [{main }], want main repository branches [{dev }]",
-	}}
-
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			_, err := NewIndexBuilder(&tc.repo)
-			var got string
-			if err != nil {
-				got = err.Error()
-			}
-			if got != tc.errS {
-				t.Fatalf("unexpected error:\nwanted: %s\ngot:    %s", tc.errS, got)
-			}
-		})
-	}
-}
-
 func TestSearchEither(t *testing.T) {
 	b := testIndexBuilder(t, nil,
 		Document{Name: "f1", Content: []byte("bla needle bla")},
diff --git a/indexbuilder.go b/indexbuilder.go
index e316269..3ce7816 100644
--- a/indexbuilder.go
+++ b/indexbuilder.go
@@ -222,9 +222,6 @@
 				branchEqual = branchEqual && (b.Name == desc.Branches[i].Name)
 			}
 		}
-		if !branchEqual {
-			return fmt.Errorf("got subrepository branches %v, want main repository branches %v", subrepo.Branches, desc.Branches)
-		}
 	}
 
 	if len(desc.Branches) > 64 {