diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index d8393cdcf898..e98d9f4b7096 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -2393,15 +2393,6 @@ let
       preConfigure = "patchShebangs configure";
     });
 
-    cn_farms = old.cn_farms.overrideAttrs (attrs: {
-      postPatch = ''
-        # https://developer.r-project.org/blosxom.cgi/R-devel/NEWS/2025/01/08#n2025-01-08
-        substituteInPlace "src/sparse_farms.c" \
-        --replace-fail "Calloc" "R_Calloc" \
-        --replace-fail "Free" "R_Free"
-      '';
-    });
-
     covidsymptom = old.covidsymptom.overrideAttrs (attrs: {
       preConfigure = "rm R/covidsymptomdata.R";
     });