diff --git a/appveyor.yml b/appveyor.yml
index fb66b6d..703b6d0 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -12,6 +12,8 @@ environment:
   matrix:
   - arch: Win64
 
+install: git submodule update --init --recursive
+
 before_build:
 - cmd: cmake -G "Visual Studio 15 2017 Win64"