diff --git a/unicodetools/src/main/java/org/unicode/text/utility/UnicodeDataFile.java b/unicodetools/src/main/java/org/unicode/text/utility/UnicodeDataFile.java
index 8742263e8..6489c5db0 100644
--- a/unicodetools/src/main/java/org/unicode/text/utility/UnicodeDataFile.java
+++ b/unicodetools/src/main/java/org/unicode/text/utility/UnicodeDataFile.java
@@ -70,7 +70,7 @@ private UnicodeDataFile(String directory, String filename, boolean isHTML) throw
         }
         try {
             Utility.appendFile(
-                    getClass().getResource(filename + "Header" + fileType).getPath(),
+                    getClass().getResource("/").getPath() + filename + "Header" + fileType,
                     Utility.UTF8_UNIX,
                     out);
         } catch (final RuntimeIOException e) {