diff --git a/pkgs/applications/window-managers/windowmaker/dockapps/wmsm-app.nix b/pkgs/applications/window-managers/windowmaker/dockapps/wmsm-app.nix
index c201c55dcea5..225e44c21ced 100644
--- a/pkgs/applications/window-managers/windowmaker/dockapps/wmsm-app.nix
+++ b/pkgs/applications/window-managers/windowmaker/dockapps/wmsm-app.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
 
-  preInstall = ''
+  installPhase = ''
     runHook preInstall
     install -d ${placeholder "out"}/bin
     runHook postInstall
diff --git a/pkgs/development/idris-modules/build-idris-package.nix b/pkgs/development/idris-modules/build-idris-package.nix
index ac0555636be0..7869c2706999 100644
--- a/pkgs/development/idris-modules/build-idris-package.nix
+++ b/pkgs/development/idris-modules/build-idris-package.nix
@@ -36,9 +36,10 @@ stdenv.mkDerivation ({
   # Some packages use the style
   # opts = -i ../../path/to/package
   # rather than the declarative pkgs attribute so we have to rewrite the path.
-  postPatch = ''
+  patchPhase = ''
     runHook prePatch
     sed -i ${ipkgName}.ipkg -e "/^opts/ s|-i \\.\\./|-i ${idris-with-packages}/libs/|g"
+    runHook postPatch
   '';
 
   buildPhase = ''