cython: Set explicit language_level to 3str
diff --git a/cython/imobiledevice.pxd b/cython/imobiledevice.pxd
index b44e444..238df68 100644
--- a/cython/imobiledevice.pxd
+++ b/cython/imobiledevice.pxd
@@ -1,3 +1,6 @@
+#!python
+#cython: language_level=3str
+
 cimport plist
 
 from libc.stdint cimport *