diff --git a/contrib/packaging/hgpackaging/wix.py b/contrib/packaging/hgpackaging/wix.py
--- a/contrib/packaging/hgpackaging/wix.py
+++ b/contrib/packaging/hgpackaging/wix.py
@@ -343,7 +343,9 @@
     dist_dir = source_dir / 'dist'
     wix_dir = source_dir / 'contrib' / 'packaging' / 'wix'
 
-    requirements_txt = 'requirements_win32.txt'
+    requirements_txt = (
+        source_dir / 'contrib' / 'packaging' / 'requirements_win32.txt'
+    )
 
     build_py2exe(
         source_dir,