diff --git a/.travis.yml b/.travis.yml
index 635172791f..657aa13b0a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,6 +50,7 @@ script:
   - /usr/local/bin/IfcConvert -yv acad2010_walls.ifc acad2010_walls.glb
   - gltf_validator acad2010_walls.glb
   
+  - /usr/bin/python2.7 -c "from __future__ import print_function; from io import open; import ifcopenshell; f = ifcopenshell.open('encoding.ifc'); print(f[1]); print(f[1][0]);"
   - /usr/bin/python2.7 -c "from __future__ import print_function; from io import open; import ifcopenshell; f = ifcopenshell.open('encoding.ifc'); print(f[1][0], file=open('encoding.txt', 'w', encoding='utf-8'))" && grep "'a' 1m³ ≤ 5m³ ≥ 10m³" encoding.txt
   
   - |