diff --git a/internal/runner/cleanup.go b/internal/runner/cleanup.go
deleted file mode 100644
index 2547b919e..000000000
--- a/internal/runner/cleanup.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package runner
-
-// cleanup stacks cleanup functions to call when Close is called.
-func (r *Runner) cleanup(f func()) {
-	oldF := r.cleanupFunc
-	r.cleanupFunc = func() {
-		defer f()
-		if oldF != nil {
-			oldF()
-		}
-	}
-}