diff --git a/libcxx/appveyor.yml b/libcxx/appveyor.yml
index f966c0c90fcb..83a1d949578c 100644
--- a/libcxx/appveyor.yml
+++ b/libcxx/appveyor.yml
@@ -62,7 +62,7 @@ build_script:
   - "%MAKE_PROGRAM%"
 
 test_script:
-  - "%MAKE_PROGRAM%" check-cxx
+  - "%MAKE_PROGRAM% check-cxx"
 
 on_failure:
   - appveyor PushArtifact CMakeFiles/CMakeOutput.log