2 files changed, 4 insertions, 4 deletions
diff --git a/doc/languages-frameworks/emscripten.section.md b/doc/languages-frameworks/emscripten.section.md
index 20d358f2e9e3f..9ce48db2c2ded 100644
--- a/doc/languages-frameworks/emscripten.section.md
+++ b/doc/languages-frameworks/emscripten.section.md
@@ -86,9 +86,9 @@ One advantage is that when `pkgs.zlib` is updated, it will automatically update
 
   postPatch = pkgs.lib.optionalString pkgs.stdenv.isDarwin ''
     substituteInPlace configure \
-      --replace '/usr/bin/libtool' 'ar' \
-      --replace 'AR="libtool"' 'AR="ar"' \
-      --replace 'ARFLAGS="-o"' 'ARFLAGS="-r"'
+      --replace-fail '/usr/bin/libtool' 'ar' \
+      --replace-fail 'AR="libtool"' 'AR="ar"' \
+      --replace-fail 'ARFLAGS="-o"' 'ARFLAGS="-r"'
   '';
 })
 ```
diff --git a/doc/languages-frameworks/rust.section.md b/doc/languages-frameworks/rust.section.md
index a81ba1e456e8e..72bade25a9fbb 100644
--- a/doc/languages-frameworks/rust.section.md
+++ b/doc/languages-frameworks/rust.section.md
@@ -701,7 +701,7 @@ with import <nixpkgs> {};
     hello = attrs: lib.optionalAttrs (lib.versionAtLeast attrs.version "1.0")  {
       postPatch = ''
         substituteInPlace lib/zoneinfo.rs \
-          --replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
+          --replace-fail "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
       '';
     };
   };