diff --git a/appveyor.yml b/appveyor.yml
index 10b687a..8684d5d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,3 +1,5 @@
+os: Visual Studio 2015
+
 cache:
   - c:\cargo\registry
   - c:\cargo\git
@@ -12,12 +14,8 @@ environment:
   RUSTUP_HOME: "c:\\rustup"
 
   matrix:
-    - TARGET: i686-pc-windows-gnu
-      CHANNEL: stable
     - TARGET: i686-pc-windows-msvc
       CHANNEL: stable
-    - TARGET: x86_64-pc-windows-gnu
-      CHANNEL: stable
     - TARGET: x86_64-pc-windows-msvc
       CHANNEL: stable