1 files changed, 5 insertions, 2 deletions
diff --git a/pkgs/build-support/fetchsvn/default.nix b/pkgs/build-support/fetchsvn/default.nix
index 747052c1cb7..6ed34ec0276 100644
--- a/pkgs/build-support/fetchsvn/default.nix
+++ b/pkgs/build-support/fetchsvn/default.nix
@@ -25,14 +25,17 @@ let
   name_ = if name == null then "${repoName}-r${toString rev}" else name;
 in
 
+if md5 != "" then
+  throw "fetchsvn does not support md5 anymore, please use sha256"
+else
 stdenv.mkDerivation {
   name = name_;
   builder = ./builder.sh;
   buildInputs = [subversion];
 
-  outputHashAlgo = if sha256 == "" then "md5" else "sha256";
+  outputHashAlgo = "sha256";
   outputHashMode = "recursive";
-  outputHash = if sha256 == "" then md5 else sha256;
+  outputHash = sha256;
 
   inherit url rev sshSupport openssh ignoreExternals ignoreKeywords;