diff --git a/appveyor.yml b/appveyor.yml
index 4e9d807b..8365a53a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -15,12 +15,13 @@ platform:
   - x86
   - x64
 
-matrix:
-  - TOOLSET: msvc-9.0
-  - TOOLSET: msvc-10.0
-  - TOOLSET: msvc-11.0
-  - TOOLSET: msvc-12.0
-  - TOOLSET: msvc-14.0
+environment:
+  matrix:
+    - TOOLSET: msvc-9.0
+    - TOOLSET: msvc-10.0
+    - TOOLSET: msvc-11.0
+    - TOOLSET: msvc-12.0
+    - TOOLSET: msvc-14.0
 
 install:
   - cd ..