diff --git a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/EndpointServlet.java b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/EndpointServlet.java
index 1731d6cb8c..44239b2fde 100644
--- a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/EndpointServlet.java
+++ b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/EndpointServlet.java
@@ -61,9 +61,9 @@ public final class EndpointServlet {
 
 	public EndpointServlet withInitParameters(Map<String, String> initParameters) {
 		Assert.notNull(initParameters, "InitParameters must not be null");
-		boolean hasEmptyKey = initParameters.values().stream()
-				.anyMatch((key) -> !StringUtils.hasText(key));
-		Assert.isTrue(!hasEmptyKey, "InitParameters must not contain empty keys");
+		boolean hasEmptyName = initParameters.keySet().stream()
+				.anyMatch((name) -> !StringUtils.hasText(name));
+		Assert.isTrue(!hasEmptyName, "InitParameters must not contain empty names");
 		Map<String, String> mergedInitParameters = new LinkedHashMap<>(
 				this.initParameters);
 		mergedInitParameters.putAll(initParameters);