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-rw-r--r--pkgs/development/tools/parsing/antlr/4.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/parsing/antlr/4.nix b/pkgs/development/tools/parsing/antlr/4.nix
index 94ca0fee523..512732d0627 100644
--- a/pkgs/development/tools/parsing/antlr/4.nix
+++ b/pkgs/development/tools/parsing/antlr/4.nix
@@ -81,7 +81,7 @@ let
         pname = "antlr-runtime-cpp";
         inherit version;
         src = source;
-        sourceRoot = "source/runtime/Cpp";
+        sourceRoot = "${source.name}/runtime/Cpp";
 
         outputs = [ "out" "dev" "doc" ];