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-rw-r--r--pkgs/applications/editors/rstudio/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/editors/rstudio/default.nix b/pkgs/applications/editors/rstudio/default.nix
index 27c956dcd14..f90e17a6065 100644
--- a/pkgs/applications/editors/rstudio/default.nix
+++ b/pkgs/applications/editors/rstudio/default.nix
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
     sha256 = "19x000m3jwnkqgi6ic81lkzyjvvxcfacw2j0vcfcaknvvagzhyhb";
   };
 
-  hunspellDictionaries = with stdenv.lib; filter isDerivation (attrValues hunspellDicts);
+  hunspellDictionaries = with stdenv.lib; filter isDerivation (unique (attrValues hunspellDicts));
 
   mathJaxSrc = fetchurl {
     url = https://s3.amazonaws.com/rstudio-buildtools/mathjax-26.zip;