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-rw-r--r--pkgs/development/tools/pypi2nix/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/pypi2nix/default.nix b/pkgs/development/tools/pypi2nix/default.nix
index 02ab4c06a50a..2884b23049ab 100644
--- a/pkgs/development/tools/pypi2nix/default.nix
+++ b/pkgs/development/tools/pypi2nix/default.nix
@@ -36,7 +36,7 @@ in stdenv.mkDerivation rec {
     # mv effect-*/effect                 $out/pkgs/effect
     mv requests-*/requests              $out/pkgs/
 
-    if [ "$IN_NIX_SHELL" != "1" ]; then
+    if [ -z "$IN_NIX_SHELL" ]; then
       if [ -e git-export ]; then
         mv git-export/src/pypi2nix      $out/pkgs/pypi2nix
       else