diff --git a/module/spring-boot-restclient/src/test/java/org/springframework/boot/restclient/RootUriBuilderFactoryTests.java b/module/spring-boot-restclient/src/test/java/org/springframework/boot/restclient/RootUriBuilderFactoryTests.java
index 7251decdd0b..445d93d93c0 100644
--- a/module/spring-boot-restclient/src/test/java/org/springframework/boot/restclient/RootUriBuilderFactoryTests.java
+++ b/module/spring-boot-restclient/src/test/java/org/springframework/boot/restclient/RootUriBuilderFactoryTests.java
@@ -32,6 +32,7 @@ import static org.mockito.Mockito.mock;
  * Tests for {@link RootUriBuilderFactory}.
  *
  * @author Scott Frederick
+ * @author Hyunwoo Gu
  */
 class RootUriBuilderFactoryTests {
 
@@ -43,4 +44,12 @@ class RootUriBuilderFactoryTests {
 		assertThat(builder.build()).isEqualTo(new URI("https://example.com/hello"));
 	}
 
+	@Test
+	void uriStringWhenEmptyShouldReturnRoot() throws URISyntaxException {
+		UriBuilderFactory builderFactory = new RootUriBuilderFactory("https://example.com",
+				mock(UriTemplateHandler.class));
+		UriBuilder builder = builderFactory.uriString("");
+		assertThat(builder.build()).isEqualTo(new URI("https://example.com"));
+	}
+
 }