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-rw-r--r--pkgs/development/interpreters/ruby/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index a87131ff40b..58ccf5ae9b4 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -151,7 +151,7 @@ let
           export GEM_HOME="$out/${passthru.gemPath}"
         '';
 
-        installFlags = stdenv.lib.optionalString docSupport "install-doc";
+        installFlags = stdenv.lib.optional docSupport "install-doc";
         # Bundler tries to create this directory
         postInstall = ''
           # Remove unnecessary groff reference from runtime closure, since it's big