diff --git a/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/HeapdumpMvcEndpointTests.java b/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/HeapdumpMvcEndpointTests.java
index e1547951765..42157bee1db 100644
--- a/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/HeapdumpMvcEndpointTests.java
+++ b/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/HeapdumpMvcEndpointTests.java
@@ -152,6 +152,9 @@ public class HeapdumpMvcEndpointTests {
 					if (TestHeapdumpMvcEndpoint.this.locked) {
 						throw new InterruptedException();
 					}
+					if (file.exists()) {
+						throw new IOException("File exists");
+					}
 					FileCopyUtils.copy(TestHeapdumpMvcEndpoint.this.heapDump.getBytes(),
 							file);
 				}