diff --git a/packages/python/web/zope.interface/install b/packages/python/web/zope.interface/install
index a89072f766..1294004669 100755
--- a/packages/python/web/zope.interface/install
+++ b/packages/python/web/zope.interface/install
@@ -4,4 +4,7 @@
 
 PKG_SRC_DIR=`ls -d $PKG_BUILD`
 
+PYTHON_IMAGE_DIR="`ls -d $INSTALL/usr/lib/python*`"
+export PYTHONPATH="$PYTHON_IMAGE_DIR/site-packages"
+
 $TOOLCHAIN/bin/easy_install --exclude-scripts --zip-ok --no-deps --quiet --prefix=$INSTALL/usr $PKG_SRC_DIR/dist/*.egg