diff --git a/builder/builder-next/reqbodyhandler.go b/builder/builder-next/reqbodyhandler.go
index 48433908fb..b07503de13 100644
--- a/builder/builder-next/reqbodyhandler.go
+++ b/builder/builder-next/reqbodyhandler.go
@@ -35,6 +35,7 @@ func (h *reqBodyHandler) newRequest(rc io.ReadCloser) (string, func()) {
 		h.mu.Lock()
 		delete(h.requests, id)
 		h.mu.Unlock()
+		rc.Close()
 	}
 }