diff --git a/var/spack/repos/builtin/packages/r-futile-options/package.py b/var/spack/repos/builtin/packages/r-futile-options/package.py
index 21a1d0d817..e254610bc6 100644
--- a/var/spack/repos/builtin/packages/r-futile-options/package.py
+++ b/var/spack/repos/builtin/packages/r-futile-options/package.py
@@ -30,5 +30,6 @@ class RFutileOptions(RPackage):
 
     homepage = "https://cran.rstudio.com/web/packages/futile.options/index.html"
     url      = "https://cran.rstudio.com/src/contrib/futile.options_1.0.0.tar.gz"
+    list_url = "https://cran.rstudio.com/src/contrib/Archive/futile.options"
 
     version('1.0.0', '8fd845774bbce56f41f7c43c3b4c13ba')
diff --git a/var/spack/repos/builtin/packages/r-lambda-r/package.py b/var/spack/repos/builtin/packages/r-lambda-r/package.py
index 4e5c927670..79dc5e1bc6 100644
--- a/var/spack/repos/builtin/packages/r-lambda-r/package.py
+++ b/var/spack/repos/builtin/packages/r-lambda-r/package.py
@@ -32,5 +32,6 @@ class RLambdaR(RPackage):
 
     homepage = "https://cran.rstudio.com/web/packages/lambda.r/index.html"
     url      = "https://cran.rstudio.com/src/contrib/lambda.r_1.2.tar.gz"
+    list_url = "https://cran.rstudio.com/src/contrib/Archive/lambda.r"
 
     version('1.2', 'bda49898b85ad5902880a31f43b432e2')