diff --git a/server/bootstrap/src/org/labkey/bootstrap/LabKeyBootstrapClassLoader.java b/server/bootstrap/src/org/labkey/bootstrap/LabKeyBootstrapClassLoader.java
index 0ce6b06436..fee0f876bc 100644
--- a/server/bootstrap/src/org/labkey/bootstrap/LabKeyBootstrapClassLoader.java
+++ b/server/bootstrap/src/org/labkey/bootstrap/LabKeyBootstrapClassLoader.java
@@ -210,7 +210,7 @@ public void validateReplaceArchive(File explodedModuleDirectory, File updatedArc
     @Override
     public Map.Entry<File,File> updateModule(File explodedModuleDirectory, File updateArchive, File existingArchive, File mvExistingArchive, boolean dryRun) throws IOException
     {
-        File updateArchiveNewHome = new File(existingArchive.getParent(), updateArchive.getName());
+        File updateArchiveNewHome = new File(existingArchive.getParentFile(), updateArchive.getName());
 
         validateReplaceArchive(explodedModuleDirectory, updateArchive, existingArchive);