Use EQU instead.

octalmage · octalmage · commit 755bcd1eadc5 · 2018-02-27T01:05:46.000-06:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -32,7 +32,7 @@ test_script:
   - npm test
 
 on_success:
-  - IF "%APPVEYOR_PULL_REQUEST_NUMBER%"="" npm run prebuild -- -u %GITHUB_TOKEN%
+  - IF "%APPVEYOR_PULL_REQUEST_NUMBER%" EQU "" npm run prebuild -- -u %GITHUB_TOKEN%
 
 build: off
 version: "{build}"
