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-rw-r--r--pkgs/tools/typesetting/pdfgrep/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/typesetting/pdfgrep/default.nix b/pkgs/tools/typesetting/pdfgrep/default.nix
index e05e4d16a06..ff3bad12bc5 100644
--- a/pkgs/tools/typesetting/pdfgrep/default.nix
+++ b/pkgs/tools/typesetting/pdfgrep/default.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   meta = {
     description = "a tool to search text in PDF files";
     homepage = http://pdfgrep.sourceforge.net/;
-    license = "free";
+    license = stdenv.lib.licenses.free;
     maintainers = with stdenv.lib.maintainers; [qknight];
     platforms = with stdenv.lib.platforms; linux;
   };