diff --git a/appveyor-test.yml b/appveyor-test.yml
index 9f60ff03..8766d0e2 100644
--- a/appveyor-test.yml
+++ b/appveyor-test.yml
@@ -1,4 +1,4 @@
-version: {build}
+version: '{build}'
 image: Visual Studio 2017
 platform: x86
 configuration: Debug