1 files changed, 1 insertions, 1 deletions
diff --git a/testing/src/test/java/org/aspectj/testing/util/FileUtil.java b/testing/src/test/java/org/aspectj/testing/util/FileUtil.java
index 03b29a85a..103eba59b 100644
--- a/testing/src/test/java/org/aspectj/testing/util/FileUtil.java
+++ b/testing/src/test/java/org/aspectj/testing/util/FileUtil.java
@@ -477,7 +477,7 @@ public class FileUtil {
         throws IOException {
         String path = in.getCanonicalPath();
         String parentPath = parent.getCanonicalPath();
-        if (!path.startsWith(parentPath)) {
+        if (!in.getCanonicalFile().toPath().startsWith(parentPath)) {
             throw new Error("not parent: " + parentPath + " of " + path);
         } else {
             path = path.substring(1+parentPath.length());