diff --git a/pkgs/development/tools/ocaml/camlp5/default.nix b/pkgs/development/tools/ocaml/camlp5/default.nix
index 0acd70b424a..31cd7ccfd2c 100644
--- a/pkgs/development/tools/ocaml/camlp5/default.nix
+++ b/pkgs/development/tools/ocaml/camlp5/default.nix
@@ -6,15 +6,22 @@ in
 
 stdenv.mkDerivation {
 
-  name = "camlp5${if transitional then "_transitional" else ""}-7.03";
+  name = "camlp5${if transitional then "_transitional" else ""}-7.05";
 
   src = fetchzip {
-    url = https://github.com/camlp5/camlp5/archive/rel703.tar.gz;
-    sha256 = "0bwzhp4qjypfa0x8drp8w434dfixm1nzrm6pcy9s5akpmqvb50a8";
+    url = https://github.com/camlp5/camlp5/archive/rel705.tar.gz;
+    sha256 = "16igfyjl2jja4f1mibjfzk0c2jr09nxsz6lb63x1jkccmy6430q2";
   };
 
   buildInputs = [ ocaml ];
 
+  postPatch = ''
+    for p in compile/compile.sh config/Makefile.tpl test/Makefile test/check_ocaml_versions.sh
+    do
+      substituteInPlace $p --replace '/bin/rm' rm
+    done
+  '';
+
   prefixKey = "-prefix ";
 
   preConfigure = "configureFlagsArray=(" +  (if transitional then "--transitional" else "--strict") +