1 files changed, 4 insertions, 2 deletions
diff --git a/setuptools/command/install_egg_info.py b/setuptools/command/install_egg_info.py
index 3e413898..fd0f118b 100755
--- a/setuptools/command/install_egg_info.py
+++ b/setuptools/command/install_egg_info.py
@@ -68,11 +68,13 @@ class install_egg_info(Command):
         filename += '-nspkg.pth'
         self.outputs.append(filename)
         log.info("Installing %s", filename)
+        lines = map(self._gen_nspkg_line, nsp)
+
         if self.dry_run:
+            # always generate the lines, even in dry run
+            list(lines)
             return
 
-        lines = map(self._gen_nspkg_line, nsp)
-
         with open(filename, 'wt') as f:
             f.writelines(lines)