diff --git a/appveyor.yml b/appveyor.yml
index b09c647e..5432110d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: $(appveyor_build_version)
+version: '$(appveyor_build_version)'
 image: Visual Studio 2015
 
 assembly_info: