diff --git a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMapping.java b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMapping.java
index 1d007859ca..342bb22505 100644
--- a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMapping.java
+++ b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMapping.java
@@ -17,8 +17,10 @@
 package org.springframework.boot.actuate.endpoint.web.reactive;
 
 import java.lang.reflect.Method;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
@@ -92,6 +94,10 @@ public class ControllerEndpointHandlerMapping extends RequestMappingHandlerMappi
 	private RequestMappingInfo withEndpointMappedPatterns(
 			ExposableControllerEndpoint endpoint, RequestMappingInfo mapping) {
 		Set<PathPattern> patterns = mapping.getPatternsCondition().getPatterns();
+		if (patterns.isEmpty()) {
+			patterns = new HashSet<PathPattern>(
+					Arrays.asList(getPathPatternParser().parse("")));
+		}
 		PathPattern[] endpointMappedPatterns = patterns.stream()
 				.map((pattern) -> getEndpointMappedPattern(endpoint, pattern))
 				.toArray(PathPattern[]::new);
diff --git a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMapping.java b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMapping.java
index 57490c901e..a8a169b0a6 100644
--- a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMapping.java
+++ b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMapping.java
@@ -19,6 +19,7 @@ package org.springframework.boot.actuate.endpoint.web.servlet;
 import java.lang.reflect.Method;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -93,6 +94,9 @@ public class ControllerEndpointHandlerMapping extends RequestMappingHandlerMappi
 	private RequestMappingInfo withEndpointMappedPatterns(
 			ExposableControllerEndpoint endpoint, RequestMappingInfo mapping) {
 		Set<String> patterns = mapping.getPatternsCondition().getPatterns();
+		if (patterns.isEmpty()) {
+			patterns = new HashSet<>(Collections.singletonList(""));
+		}
 		String[] endpointMappedPatterns = patterns.stream()
 				.map((pattern) -> getEndpointMappedPattern(endpoint, pattern))
 				.toArray(String[]::new);
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMappingTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMappingTests.java
index 555155dab9..c789cb0b63 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMappingTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMappingTests.java
@@ -78,6 +78,16 @@ public class ControllerEndpointHandlerMappingTests {
 		assertThat(getHandler(mapping, HttpMethod.GET, "/second")).isNull();
 	}
 
+	@Test
+	public void mappingWithNoPath() throws Exception {
+		ExposableControllerEndpoint pathless = pathlessEndpoint();
+		ControllerEndpointHandlerMapping mapping = createMapping("actuator", pathless);
+		assertThat(getHandler(mapping, HttpMethod.GET, "/actuator/pathless"))
+				.isEqualTo(handlerOf(pathless.getController(), "get"));
+		assertThat(getHandler(mapping, HttpMethod.GET, "/pathless")).isNull();
+		assertThat(getHandler(mapping, HttpMethod.GET, "/")).isNull();
+	}
+
 	@Test
 	public void mappingNarrowedToMethod() throws Exception {
 		ExposableControllerEndpoint first = firstEndpoint();
@@ -118,6 +128,10 @@ public class ControllerEndpointHandlerMappingTests {
 		return mockEndpoint("second", new SecondTestMvcEndpoint());
 	}
 
+	private ExposableControllerEndpoint pathlessEndpoint() {
+		return mockEndpoint("pathless", new PathlessControllerEndpoint());
+	}
+
 	private ExposableControllerEndpoint mockEndpoint(String id, Object controller) {
 		ExposableControllerEndpoint endpoint = mock(ExposableControllerEndpoint.class);
 		given(endpoint.getId()).willReturn(id);
@@ -146,4 +160,14 @@ public class ControllerEndpointHandlerMappingTests {
 
 	}
 
+	@ControllerEndpoint(id = "pathless")
+	private static class PathlessControllerEndpoint {
+
+		@GetMapping
+		public String get() {
+			return "test";
+		}
+
+	}
+
 }
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMappingTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMappingTests.java
index 7b18f684e4..acdc57b70b 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMappingTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMappingTests.java
@@ -84,6 +84,16 @@ public class ControllerEndpointHandlerMappingTests {
 		mapping.getHandler(request("POST", "/actuator/first"));
 	}
 
+	@Test
+	public void mappingWithNoPath() throws Exception {
+		ExposableControllerEndpoint pathless = pathlessEndpoint();
+		ControllerEndpointHandlerMapping mapping = createMapping("actuator", pathless);
+		assertThat(mapping.getHandler(request("GET", "/actuator/pathless")).getHandler())
+				.isEqualTo(handlerOf(pathless.getController(), "get"));
+		assertThat(mapping.getHandler(request("GET", "/pathless"))).isNull();
+		assertThat(mapping.getHandler(request("GET", "/"))).isNull();
+	}
+
 	private ControllerEndpointHandlerMapping createMapping(String prefix,
 			ExposableControllerEndpoint... endpoints) {
 		ControllerEndpointHandlerMapping mapping = new ControllerEndpointHandlerMapping(
@@ -110,6 +120,10 @@ public class ControllerEndpointHandlerMappingTests {
 		return mockEndpoint("second", new SecondTestMvcEndpoint());
 	}
 
+	private ExposableControllerEndpoint pathlessEndpoint() {
+		return mockEndpoint("pathless", new PathlessControllerEndpoint());
+	}
+
 	private ExposableControllerEndpoint mockEndpoint(String id, Object controller) {
 		ExposableControllerEndpoint endpoint = mock(ExposableControllerEndpoint.class);
 		given(endpoint.getId()).willReturn(id);
@@ -138,4 +152,14 @@ public class ControllerEndpointHandlerMappingTests {
 
 	}
 
+	@ControllerEndpoint(id = "pathless")
+	private static class PathlessControllerEndpoint {
+
+		@GetMapping
+		public String get() {
+			return "test";
+		}
+
+	}
+
 }