diff --git a/appveyor.yml b/appveyor.yml
index 2635f283f..4ee150e23 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -26,6 +26,7 @@ install:
   - "C:/Python27/python.exe C:/get-pip.py"
   - "C:/Python27/Scripts/pip.exe install pyjavaproperties"
   - "C:/Python27/Scripts/pip.exe install github3.py"
+  - git submodule update --init --recursive
 
 #---------------------------------#
 #       build configuration       #