diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index b1222fe93..b42edb0c6 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -22,6 +22,7 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -1043,12 +1044,13 @@ func TestBuildConfig(t *testing.T) {
 			},
 		},
 		{
+			// RBE is only supported on linux.
 			name:    "use rbe",
 			environ: Environment{"USE_RBE=1"},
 			expectedBuildConfig: &smpb.BuildConfig{
 				ForceUseGoma:          proto.Bool(false),
 				UseGoma:               proto.Bool(false),
-				UseRbe:                proto.Bool(true),
+				UseRbe:                proto.Bool(runtime.GOOS == "linux"),
 				NinjaWeightListSource: smpb.BuildConfig_NOT_USED.Enum(),
 			},
 		},
diff --git a/ui/build/rbe_test.go b/ui/build/rbe_test.go
index 266f76b35..d1b8e2644 100644
--- a/ui/build/rbe_test.go
+++ b/ui/build/rbe_test.go
@@ -19,6 +19,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -26,6 +27,10 @@ import (
 )
 
 func TestDumpRBEMetrics(t *testing.T) {
+	// RBE is only supported on linux.
+	if runtime.GOOS != "linux" {
+		t.Skip("RBE is only supported on linux")
+	}
 	ctx := testContext()
 	tests := []struct {
 		description string
@@ -82,6 +87,10 @@ func TestDumpRBEMetrics(t *testing.T) {
 }
 
 func TestDumpRBEMetricsErrors(t *testing.T) {
+	// RBE is only supported on linux.
+	if runtime.GOOS != "linux" {
+		t.Skip("RBE is only supported on linux")
+	}
 	ctx := testContext()
 	tests := []struct {
 		description      string