appveyor: install liblzma
diff --git a/appveyor.yml b/appveyor.yml
index 379282a..e4dfc44 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -64,7 +64,7 @@
 
     .\vcpkg integrate install
 
-    .\vcpkg install zlib:%TRIPLET% bzip2:%TRIPLET%
+    .\vcpkg install zlib:%TRIPLET% bzip2:%TRIPLET% liblzma:%TRIPLET%
 
     cd ..