diff --git a/iamf/api/BUILD b/iamf/api/BUILD
new file mode 100644
index 0000000..e69de29
diff --git a/iamf/cli/BUILD b/iamf/cli/BUILD
index cd247a0..19b20d9 100644
--- a/iamf/cli/BUILD
+++ b/iamf/cli/BUILD
@@ -1,6 +1,9 @@
 # Example commandline interface tools for the IAMF software.
 
-package(default_visibility = ["//iamf/cli:__subpackages__"])
+package(default_visibility = [
+    "//iamf/api:__subpackages__",
+    "//iamf/cli:__subpackages__",
+])
 
 exports_files(
     srcs = [
diff --git a/iamf/cli/proto/BUILD b/iamf/cli/proto/BUILD
index 8a3e6a2..9d833a4 100644
--- a/iamf/cli/proto/BUILD
+++ b/iamf/cli/proto/BUILD
@@ -2,7 +2,10 @@
 
 # [internal] load cc_proto_library.bzl
 
-package(default_visibility = ["//iamf/cli:__subpackages__"])
+package(default_visibility = [
+    "//iamf/api:__subpackages__",
+    "//iamf/cli:__subpackages__",
+])
 
 proto_library(
     name = "arbitrary_obu_proto",
diff --git a/iamf/cli/proto_to_obu/BUILD b/iamf/cli/proto_to_obu/BUILD
index 6c695c2..7ec19a4 100644
--- a/iamf/cli/proto_to_obu/BUILD
+++ b/iamf/cli/proto_to_obu/BUILD
@@ -1,6 +1,9 @@
 # Files to create `iamf/obu` classes from proto definitions.
 
-package(default_visibility = ["//iamf/cli:__subpackages__"])
+package(default_visibility = [
+    "//iamf/api:__subpackages__",
+    "//iamf/cli:__subpackages__",
+])
 
 cc_library(
     name = "arbitrary_obu_generator",
diff --git a/iamf/cli/testdata/BUILD b/iamf/cli/testdata/BUILD
index 14def20..a156dae 100644
--- a/iamf/cli/testdata/BUILD
+++ b/iamf/cli/testdata/BUILD
@@ -1,4 +1,7 @@
-package(default_visibility = ["//iamf/cli:__subpackages__"])
+package(default_visibility = [
+    "//iamf/api:__subpackages__",
+    "//iamf/cli:__subpackages__",
+])
 
 filegroup(
     name = "input_wav_files",
diff --git a/iamf/cli/textproto_templates/BUILD b/iamf/cli/textproto_templates/BUILD
index 5abe128..f3a9a80 100644
--- a/iamf/cli/textproto_templates/BUILD
+++ b/iamf/cli/textproto_templates/BUILD
@@ -1,4 +1,7 @@
-package(default_visibility = ["//iamf/cli:__subpackages__"])
+package(default_visibility = [
+    "//iamf/api:__subpackages__",
+    "//iamf/cli:__subpackages__",
+])
 
 filegroup(
     name = "textprotos",