diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index efc889c..8fb2660 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -36,6 +36,7 @@
 func registerBuildComponents(ctx android.RegistrationContext) {
 	ctx.RegisterModuleType("android_filesystem", filesystemFactory)
 	ctx.RegisterModuleType("android_system_image", systemImageFactory)
+	ctx.RegisterModuleType("android_system_image_defaults", systemImageDefaultsFactory)
 	ctx.RegisterModuleType("avb_add_hash_footer", avbAddHashFooterFactory)
 	ctx.RegisterModuleType("avb_add_hash_footer_defaults", avbAddHashFooterDefaultsFactory)
 	ctx.RegisterModuleType("avb_gen_vbmeta_image", avbGenVbmetaImageFactory)
diff --git a/filesystem/filesystem_test.go b/filesystem/filesystem_test.go
index d5ea2bc..5c780f8 100644
--- a/filesystem/filesystem_test.go
+++ b/filesystem/filesystem_test.go
@@ -364,3 +364,72 @@
 		t.Error("prebuilt should use cov variant of filesystem")
 	}
 }
+
+func TestSystemImageDefaults(t *testing.T) {
+	result := fixture.RunTestWithBp(t, `
+		android_system_image_defaults {
+			name: "defaults",
+			multilib: {
+				common: {
+					deps: [
+						"phony",
+					],
+				},
+				lib64: {
+					deps: [
+						"libbar",
+					],
+				},
+			},
+			compile_multilib: "both",
+		}
+
+		android_system_image {
+			name: "system",
+			defaults: ["defaults"],
+			multilib: {
+				lib32: {
+					deps: [
+						"foo",
+						"libbar",
+					],
+				},
+			},
+		}
+
+		cc_binary {
+			name: "foo",
+			compile_multilib: "prefer32",
+		}
+
+		cc_library {
+			name: "libbar",
+			required: ["libbaz"],
+		}
+
+		cc_library {
+			name: "libbaz",
+		}
+
+		phony {
+			name: "phony",
+			required: ["libquz"],
+		}
+
+		cc_library {
+			name: "libquz",
+		}
+	`)
+
+	fs := result.ModuleForTests("system", "android_common").Module().(*systemImage)
+	expected := []string{
+		"bin/foo",
+		"lib/libbar.so",
+		"lib64/libbar.so",
+		"lib64/libbaz.so",
+		"lib64/libquz.so",
+	}
+	for _, e := range expected {
+		android.AssertStringListContains(t, "missing entry", fs.entries, e)
+	}
+}
diff --git a/filesystem/system_image.go b/filesystem/system_image.go
index 5028a49..92bb206 100644
--- a/filesystem/system_image.go
+++ b/filesystem/system_image.go
@@ -21,6 +21,7 @@
 
 type systemImage struct {
 	filesystem
+	android.DefaultableModuleBase
 
 	properties systemImageProperties
 }
@@ -39,6 +40,7 @@
 	module.filesystem.buildExtraFiles = module.buildExtraFiles
 	module.filesystem.filterPackagingSpec = module.filterPackagingSpec
 	initFilesystemModule(&module.filesystem)
+	android.InitDefaultableModule(module)
 	return module
 }
 
@@ -100,3 +102,17 @@
 func (s *systemImage) filterPackagingSpec(ps android.PackagingSpec) bool {
 	return ps.Partition() == "system"
 }
+
+type systemImageDefaults struct {
+	android.ModuleBase
+	android.DefaultsModuleBase
+}
+
+// android_system_image_defaults is a default module for android_system_image module.
+func systemImageDefaultsFactory() android.Module {
+	module := &systemImageDefaults{}
+	module.AddProperties(&android.PackagingProperties{})
+	module.AddProperties(&systemImageProperties{})
+	android.InitDefaultsModule(module)
+	return module
+}