diff --git a/appveyor.yml b/appveyor.yml
index 13d8a46..93474b4 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -3,6 +3,7 @@ image: Visual Studio 2019
 
 install:
   - choco install gitversion.portable -pre -y
+  - git submodule update --init --recursive
 
 before_build:
   - nuget restore Windows\MassiveKnob.sln