diff --git a/pkg/pypi/build.sh b/pkg/pypi/build.sh
index c223d9f..f8554b5 100755
--- a/pkg/pypi/build.sh
+++ b/pkg/pypi/build.sh
@@ -7,6 +7,8 @@ ext()
 {
 	# Symbolic link to source tree so that sdist structure makes sense
 	ln -s ../../ native
+	# Re-build wrapper to export C symbols
+	swig -c++ -python -o native/src/bindings/python/zt_wrap.cpp -I./native/include native/src/bindings/python/zt.i
 	# Copy language bindings into module directory
 	cp -f native/src/bindings/python/*.py libzt/
 	cp -f native/LICENSE.txt LICENSE
diff --git a/pkg/pypi/libzt/version.py b/pkg/pypi/libzt/version.py
index 9633af7..1956efa 100644
--- a/pkg/pypi/libzt/version.py
+++ b/pkg/pypi/libzt/version.py
@@ -1 +1 @@
-__version__ = "1.3.4b0"
+__version__ = "1.3.4b1"