diff --git a/izpack-tools/src/main/java/com/izforge/izpack/util/FileUtil.java b/izpack-tools/src/main/java/com/izforge/izpack/util/FileUtil.java
index 8a9f0e5d24..5c611a13e5 100644
--- a/izpack-tools/src/main/java/com/izforge/izpack/util/FileUtil.java
+++ b/izpack-tools/src/main/java/com/izforge/izpack/util/FileUtil.java
@@ -243,7 +243,7 @@ public static String getRelativeFileName(File file, File basedir) throws IOExcep
         }
         String canonicalFilePath = file.getCanonicalPath();
         String canonicalBaseDirPath = basedir.getCanonicalPath();
-        if (canonicalFilePath.startsWith(canonicalBaseDirPath))
+        if (file.getCanonicalFile().toPath().startsWith(canonicalBaseDirPath))
         {
             int length = canonicalBaseDirPath.length();
             if (length < canonicalFilePath.length())