diff --git a/nix/sources.nix b/nix/sources.nix
index fe3dadf..0e2494d 100644
--- a/nix/sources.nix
+++ b/nix/sources.nix
@@ -7,22 +7,16 @@ let
   #
 
   fetch_file = pkgs: name: spec:
-    let
-      name' = sanitizeName name + "-src";
-    in
     if spec.builtin or true then
-      builtins_fetchurl { inherit (spec) url sha256; name = name'; }
+      builtins_fetchurl { inherit (spec) url sha256; name = "source"; }
     else
-      pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
+      pkgs.fetchurl { inherit (spec) url sha256; name = "source"; };
 
   fetch_tarball = pkgs: name: spec:
-    let
-      name' = sanitizeName name + "-src";
-    in
     if spec.builtin or true then
-      builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
+      builtins_fetchTarball { name = "source"; inherit (spec) url sha256; }
     else
-      pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
+      pkgs.fetchzip { name = "source"; inherit (spec) url sha256; };
 
   fetch_git = name: spec:
     let
@@ -69,16 +63,6 @@ let
   # Various helpers
   #
 
-  # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
-  sanitizeName = name:
-    (
-      concatMapStrings (s: if builtins.isList s then "-" else s)
-        (
-          builtins.split "[^[:alnum:]+._?=-]+"
-            ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
-        )
-    );
-
   # The set of packages used when specs are fetched using non-builtins.
   mkPkgs = sources: system:
     let
diff --git a/src/Niv/Sources.hs b/src/Niv/Sources.hs
index 751c455..979de1d 100644
--- a/src/Niv/Sources.hs
+++ b/src/Niv/Sources.hs
@@ -181,6 +181,8 @@ data SourcesNixVersion
   | -- formatting fix
     -- Apply statix suggestions
     V28
+  | -- always use "source" for store path names
+    V29
   deriving stock (Bounded, Enum, Eq)
 
 -- | A user friendly version
@@ -214,6 +216,7 @@ sourcesVersionToText = \case
   V26 -> "26"
   V27 -> "27"
   V28 -> "28"
+  V29 -> "29"
 
 latestVersionMD5 :: T.Text
 latestVersionMD5 = sourcesVersionToMD5 maxBound
@@ -254,6 +257,7 @@ sourcesVersionToMD5 = \case
   V26 -> "937bff93370a064c9000f13cec5867f9"
   V27 -> "8031ba9d8fbbc7401c800d0b84278ec8"
   V28 -> "26ed55356db7673935329210a4f8c4a5"
+  V29 -> "77f9fbf2fe7c64e079862e53145a2af9"
 
 -- | The MD5 sum of ./nix/sources.nix
 sourcesNixMD5 :: IO T.Text