diff --git a/src/nix/shell.cc b/src/nix/shell.cc
index 5e1d53aff..a4488b229 100644
--- a/src/nix/shell.cc
+++ b/src/nix/shell.cc
@@ -30,7 +30,6 @@ BuildEnvironment readEnvironment(const Path & path)
     std::set<std::string> exported;
 
     auto file = readFile(path);
-    //auto file = readFile("/tmp/x");
 
     auto pos = file.cbegin();