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-rw-r--r--src/nix/develop.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nix/develop.cc b/src/nix/develop.cc
index 07672a80a..2790ff154 100644
--- a/src/nix/develop.cc
+++ b/src/nix/develop.cc
@@ -318,7 +318,7 @@ struct Common : InstallableCommand, MixProfile
for (auto & i : {"TMP", "TMPDIR", "TEMP", "TEMPDIR"})
out << fmt("export %s=\"$NIX_BUILD_TOP\"\n", i);
- out << "eval \"$shellHook\"\n";
+ out << "eval \"${shellHook:-}\"\n";
auto script = out.str();