diff --git a/build.sh b/build.sh
index 20c17b89d..a6819af99 100755
--- a/build.sh
+++ b/build.sh
@@ -131,7 +131,7 @@ RunGulp()
     LintUI
 
     ProgressStart 'Running gulp'
-    CheckExitCode npm run build -- --production
+    CheckExitCode yarn build --production
     ProgressEnd 'Running gulp'
 }