diff --git a/appveyor.yml b/appveyor.yml
index 15f16ab..102fb5f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -19,18 +19,18 @@ environment:
   matrix:
   - R_VERSION: release
 
-  - R_version: devel
+  - R_VERSION: devel
 
-  - R_version: oldrel
+  - R_VERSION: oldrel
     CRAN: http://cran.rstudio.com
 
   - R_VERSION: release
     R_ARCH: x64
 
-  - R_version: devel
+  - R_VERSION: devel
     R_ARCH: x64
 
-  - R_version: oldrel
+  - R_VERSION: oldrel
     R_ARCH: x64
     CRAN: http://cran.rstudio.com