diff --git a/pkgs/by-name/ma/matrix-authentication-service/package.nix b/pkgs/by-name/ma/matrix-authentication-service/package.nix
index 3379e7f2efe9..c7da57cc5d64 100644
--- a/pkgs/by-name/ma/matrix-authentication-service/package.nix
+++ b/pkgs/by-name/ma/matrix-authentication-service/package.nix
@@ -63,13 +63,13 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   postPatch = ''
     substituteInPlace crates/config/src/sections/http.rs \
-      --replace ./frontend/dist/    "$out/share/$pname/assets/"
+      --replace-fail ./frontend/dist/    "$out/share/$pname/assets/"
     substituteInPlace crates/config/src/sections/templates.rs \
-      --replace ./share/templates/    "$out/share/$pname/templates/" \
-      --replace ./share/translations/    "$out/share/$pname/translations/" \
-      --replace ./share/manifest.json "$out/share/$pname/assets/manifest.json"
+      --replace-fail ./share/templates/    "$out/share/$pname/templates/" \
+      --replace-fail ./share/translations/    "$out/share/$pname/translations/" \
+      --replace-fail ./share/manifest.json "$out/share/$pname/assets/manifest.json"
     substituteInPlace crates/config/src/sections/policy.rs \
-      --replace ./share/policy.wasm "$out/share/$pname/policy.wasm"
+      --replace-fail ./share/policy.wasm "$out/share/$pname/policy.wasm"
   '';
 
   preBuild = ''