diff --git a/build b/build
index 9d7284d7..57dc275b 100755
--- a/build
+++ b/build
@@ -302,6 +302,7 @@ eof
 
     test)
         shift # skip t
+        export PYTHONPATH="$(pwd -P)"
 
         if [ $# -lt 1 ]; then
             python3 -m cdist.test