diff --git a/legacy/src/main/java/thredds/cataloggen/config/LocalDatasetSource.java b/legacy/src/main/java/thredds/cataloggen/config/LocalDatasetSource.java
index fb2835750a..d6c7b77c04 100644
--- a/legacy/src/main/java/thredds/cataloggen/config/LocalDatasetSource.java
+++ b/legacy/src/main/java/thredds/cataloggen/config/LocalDatasetSource.java
@@ -108,7 +108,7 @@ private void checkAccessPoint() throws IOException {
 
       // Check that accessPoint file starts with accessPointHeader.
       if (!apFile.getPath().startsWith(aphFile.getPath())
-          && !apFile.getCanonicalPath().startsWith(aphFile.getCanonicalPath())) {
+          && !apFile.getCanonicalFile().toPath().startsWith(aphFile.getCanonicalFile().toPath())) {
         String tmpMsg = "The accessPoint <" + apFile.getPath() + " or " + apFile.getCanonicalPath()
             + "> must start with the accessPointHeader <" + aphFile.getPath() + " or " + aphFile.getCanonicalPath()
             + ">.";