diff --git a/pkgs/development/tools/parsing/antlr/4.nix b/pkgs/development/tools/parsing/antlr/4.nix
index 85938153862c..8753bb834de5 100644
--- a/pkgs/development/tools/parsing/antlr/4.nix
+++ b/pkgs/development/tools/parsing/antlr/4.nix
@@ -77,7 +77,7 @@ let
         pname = "antlr-runtime-cpp";
         inherit version;
         src = source;
-        sourceRoot = "runtime/Cpp";
+        sourceRoot = "source/runtime/Cpp";
 
         outputs = [ "out" "dev" "doc" ];