diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index cbaea0f0d85..35822fa78bd 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -433,6 +433,11 @@ let
     PET = [ pkgs.which pkgs.xorg.xdpyinfo pkgs.imagemagick ];
     dti = [ pkgs.which pkgs.xorg.xdpyinfo pkgs.imagemagick ];
     mzR = [ pkgs.netcdf ];
+    cluster = [ pkgs.libiconv ];
+    KernSmooth = [ pkgs.libiconv ];
+    nlme = [ pkgs.libiconv ];
+    Matrix = [ pkgs.libiconv ];
+    mgcv = [ pkgs.libiconv ];
   };
 
   packagesRequireingX = [