diff --git a/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java b/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java
index a0f978a025..3b43a450ab 100644
--- a/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java
+++ b/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java
@@ -100,7 +100,8 @@ final class ChangeableUrls implements Iterable<URL> {
 		}
 		catch (IOException ex) {
 			throw new IllegalStateException(
-					"Failed to read Class-Path attribute from manifest of jar " + url);
+					"Failed to read Class-Path attribute from manifest of jar " + url,
+					ex);
 		}
 	}