diff --git a/build/config/ozone_extra.gni b/build/config/ozone_extra.gni
index 06b3347f6490..65310915a40a 100644
--- a/build/config/ozone_extra.gni
+++ b/build/config/ozone_extra.gni
@@ -32,7 +32,7 @@ ozone_external_platform_ui_test_support_deps = []
 # interactive_ui_tests.
 ozone_external_interactive_ui_tests_deps = []
 
-if (defined(is_starboard) && is_starboard) {
+if (is_starboard) {
   ozone_external_platforms += ["starboard"]
   ozone_external_platform_deps += ["platform/starboard"]
   ozone_external_platform_test_deps += ["platform/starboard:starboard_unittests"]
diff --git a/cobalt/build/configs/cobalt.gni b/cobalt/build/configs/cobalt.gni
index 44070638245c..a00009fa3208 100644
--- a/cobalt/build/configs/cobalt.gni
+++ b/cobalt/build/configs/cobalt.gni
@@ -17,3 +17,7 @@ declare_args() {
   is_cobalt = false
   cobalt_is_release_build = false
 }
+
+declare_args() {
+  is_starboard = is_cobalt && target_os != "android"
+}
diff --git a/cobalt/build/configs/initialize_variables.gni b/cobalt/build/configs/initialize_variables.gni
index 22b8e77e9408..3b4028ab6975 100644
--- a/cobalt/build/configs/initialize_variables.gni
+++ b/cobalt/build/configs/initialize_variables.gni
@@ -21,8 +21,6 @@ declare_args() {
 
   build_type = "devel"
 
-  is_starboard = target_os != "android"
-
   # Used to guard any customizations to Chromium or third-party code for builds
   # where the Starboard porting layer is not used.
   is_native_target_build = false
diff --git a/mojo/core/test/BUILD.gn b/mojo/core/test/BUILD.gn
index 13ce9f8c5636..4b51f9c93a4b 100644
--- a/mojo/core/test/BUILD.gn
+++ b/mojo/core/test/BUILD.gn
@@ -67,7 +67,7 @@ source_set("run_all_unittests") {
     "//testing/gtest",
   ]
 
-  if (defined(is_starboard) && is_starboard) {
+  if (is_starboard) {
     # Replace the standard runner with the starboard test runner.
     sources -= [ "run_all_unittests.cc" ]
     sources += [ "//starboard/testing/run_all_unittests_starboard.cc" ]
diff --git a/starboard/android/arm/toolchain/BUILD.gn b/starboard/android/arm/toolchain/BUILD.gn
index 6b167d172557..9b1b80e21ea4 100644
--- a/starboard/android/arm/toolchain/BUILD.gn
+++ b/starboard/android/arm/toolchain/BUILD.gn
@@ -38,7 +38,6 @@ gcc_toolchain("native_target") {
   nm = "nm"
 
   toolchain_args = {
-    is_starboard = false
     is_native_target_build = true
     is_clang = true
   }
diff --git a/starboard/android/arm64/toolchain/BUILD.gn b/starboard/android/arm64/toolchain/BUILD.gn
index 96ccf4540899..702690e34a44 100644
--- a/starboard/android/arm64/toolchain/BUILD.gn
+++ b/starboard/android/arm64/toolchain/BUILD.gn
@@ -40,7 +40,6 @@ gcc_toolchain("native_target") {
   nm = "nm"
 
   toolchain_args = {
-    is_starboard = false
     is_native_target_build = true
     is_clang = true
   }