diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index b15588b08d76..864e4f228a67 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -1187,6 +1187,7 @@ let
     showtext = [ pkgs.pkg-config ];
     spate = [ pkgs.pkg-config ];
     stringi = [ pkgs.pkg-config ];
+    SynExtend = [ pkgs.zlib.dev ];
     sysfonts = [ pkgs.pkg-config ];
     systemfonts = [ pkgs.pkg-config ];
     tesseract = [ pkgs.pkg-config ];