diff --git a/tests/regres/cmd/regres/main.go b/tests/regres/cmd/regres/main.go
index bfead7c..6a7b2e5 100644
--- a/tests/regres/cmd/regres/main.go
+++ b/tests/regres/cmd/regres/main.go
@@ -1015,7 +1015,7 @@
 		checkoutDir:    checkoutDir,
 		resDir:         resDir,
 		buildDir:       filepath.Join(checkoutDir, "build"),
-		reactorBackend: backendLLVM,
+		reactorBackend: backendSubzero,
 	}
 }