diff --git a/gnu/packages/llvm.scm b/gnu/packages/llvm.scm
index ad0cb088be..a6b6a3ce8f 100644
--- a/gnu/packages/llvm.scm
+++ b/gnu/packages/llvm.scm
@@ -1584,6 +1584,7 @@ (define-public libcxx-6
     (source
      (origin
        (inherit (package-source libcxx))
+       (method url-fetch)
        (uri (llvm-uri "libcxx" version))
        (sha256
         (base32