diff --git a/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java b/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java
index 986d945768..a8c1c87be7 100644
--- a/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java
+++ b/spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java
@@ -45,6 +45,8 @@ import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpSession;
 import org.springframework.test.web.servlet.RequestBuilder;
 import org.springframework.test.web.servlet.SmartRequestBuilder;
+import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
 import org.springframework.test.web.servlet.request.RequestPostProcessor;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
@@ -435,7 +437,11 @@ final class HtmlUnitRequestBuilder implements RequestBuilder, Mergeable {
 		if (parent == null) {
 			return this;
 		}
-		if (parent instanceof RequestBuilder) {
+		if (parent instanceof MockHttpServletRequestBuilder) {
+			MockHttpServletRequestBuilder copiedParent = MockMvcRequestBuilders.get("/");
+			copiedParent.merge(parent);
+			this.parentBuilder = copiedParent;
+		} else if (parent instanceof RequestBuilder) {
 			this.parentBuilder = (RequestBuilder) parent;
 		}
 		if (parent instanceof SmartRequestBuilder) {
diff --git a/spring-test/src/test/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilderTests.java b/spring-test/src/test/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilderTests.java
index 8295edaa63..027dfaf6e6 100644
--- a/spring-test/src/test/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilderTests.java
+++ b/spring-test/src/test/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilderTests.java
@@ -895,6 +895,20 @@ public class HtmlUnitRequestBuilderTests {
 		assertThat(mockMvc.perform(requestBuilder).andReturn().getRequest().getAttribute(attrName), equalTo(attrValue));
 	}
 
+	@Test // SPR-14584
+	public void mergeDoesNotCorruptPathInfoOnParent() throws Exception {
+		String pathInfo = "/foo/bar";
+		MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new HelloController())
+				.defaultRequest(get("/"))
+				.build();
+
+		assertThat(mockMvc.perform(get(pathInfo)).andReturn().getRequest().getPathInfo(), equalTo(pathInfo));
+
+		mockMvc.perform(requestBuilder);
+
+		assertThat(mockMvc.perform(get(pathInfo)).andReturn().getRequest().getPathInfo(), equalTo(pathInfo));
+	}
+
 
 	private void assertSingleSessionCookie(String expected) {
 		com.gargoylesoftware.htmlunit.util.Cookie jsessionidCookie = webClient.getCookieManager().getCookie("JSESSIONID");