diff --git a/pkgs/development/tools/simavr/default.nix b/pkgs/development/tools/simavr/default.nix
index 9fa6b8b5716c..5ad2647ea310 100644
--- a/pkgs/development/tools/simavr/default.nix
+++ b/pkgs/development/tools/simavr/default.nix
@@ -18,6 +18,9 @@ stdenv.mkDerivation rec {
   buildFlags = "AVR_ROOT=${avrgcclibc}/avr SIMAVR_VERSION=${version}";
   installFlags = buildFlags + " DESTDIR=$(out)";
 
+  # Hack to avoid TMPDIR in RPATHs.
+  preFixup = ''rm -rf "$(pwd)" && mkdir "$(pwd)" '';
+
   postFixup = ''
     target="$out/bin/simavr"
     patchelf --set-rpath "$(patchelf --print-rpath "$target"):$out/lib" "$target"
diff --git a/pkgs/tools/typesetting/sile/default.nix b/pkgs/tools/typesetting/sile/default.nix
index 2c34a9aff32b..18ab2d1f9c7c 100644
--- a/pkgs/tools/typesetting/sile/default.nix
+++ b/pkgs/tools/typesetting/sile/default.nix
@@ -45,6 +45,9 @@ stdenv.mkDerivation rec {
       --set LUA_CPATH "${luaCPath};" \
   '';
 
+  # Hack to avoid TMPDIR in RPATHs.
+  preFixup = ''rm -rf "$(pwd)" && mkdir "$(pwd)" '';
+
   meta = {
     description = "A typesetting system";
     longDescription = ''