diff --git a/module/spring-boot-resttestclient/src/main/java/org/springframework/boot/resttestclient/TestRestTemplate.java b/module/spring-boot-resttestclient/src/main/java/org/springframework/boot/resttestclient/TestRestTemplate.java
index 1a34b268469..48118a3680e 100644
--- a/module/spring-boot-resttestclient/src/main/java/org/springframework/boot/resttestclient/TestRestTemplate.java
+++ b/module/spring-boot-resttestclient/src/main/java/org/springframework/boot/resttestclient/TestRestTemplate.java
@@ -193,7 +193,7 @@ public class TestRestTemplate {
 		if (uriTemplateHandler instanceof RootUriTemplateHandler rootHandler) {
 			return rootHandler.getRootUri();
 		}
-		return "";
+		return uriTemplateHandler.expand("").toString();
 	}
 
 	/**
diff --git a/module/spring-boot-resttestclient/src/test/java/org/springframework/boot/resttestclient/TestRestTemplateTests.java b/module/spring-boot-resttestclient/src/test/java/org/springframework/boot/resttestclient/TestRestTemplateTests.java
index ca7a163440d..c59889e850a 100644
--- a/module/spring-boot-resttestclient/src/test/java/org/springframework/boot/resttestclient/TestRestTemplateTests.java
+++ b/module/spring-boot-resttestclient/src/test/java/org/springframework/boot/resttestclient/TestRestTemplateTests.java
@@ -120,6 +120,14 @@ class TestRestTemplateTests {
 		assertThat(new TestRestTemplate(delegate).getRootUri()).isEqualTo(rootUri);
 	}
 
+	@Test
+	void getRootUriRootUriSetViaLocalTestWebServer() {
+		LocalTestWebServer localTestWebServer = LocalTestWebServer.of(Scheme.HTTPS, 7070);
+		RestTemplateBuilder delegate = new RestTemplateBuilder()
+			.uriTemplateHandler(localTestWebServer.uriBuilderFactory());
+		assertThat(new TestRestTemplate(delegate).getRootUri()).isEqualTo("https://localhost:7070");
+	}
+
 	@Test
 	void getRootUriRootUriNotSet() {
 		assertThat(new TestRestTemplate().getRootUri()).isEmpty();