diff --git a/pkgs/by-name/cs/csmith/package.nix b/pkgs/by-name/cs/csmith/package.nix
index 2e682f6d21e9..354b35dbf97a 100644
--- a/pkgs/by-name/cs/csmith/package.nix
+++ b/pkgs/by-name/cs/csmith/package.nix
@@ -9,7 +9,7 @@
   perlPackages,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "csmith";
   version = "2.3.0-unstable-2026-03-01";
 
@@ -40,13 +40,13 @@ stdenv.mkDerivation rec {
 
   postInstall = ''
     substituteInPlace $out/bin/compiler_test.pl \
-      --replace '$CSMITH_HOME/runtime' $out/include/${pname}-${version} \
-      --replace ' ''${CSMITH_HOME}/runtime' " $out/include/${pname}-${version}" \
-      --replace '$CSMITH_HOME/src/csmith' $out/bin/csmith
+      --replace-fail '$CSMITH_HOME/runtime' $out/include/csmith-${finalAttrs.version} \
+      --replace-fail ' ''${CSMITH_HOME}/runtime' " $out/include/csmith-${finalAttrs.version}" \
+      --replace-fail '$CSMITH_HOME/src/csmith' $out/bin/csmith
 
     substituteInPlace $out/bin/launchn.pl \
-      --replace '../compiler_test.pl' $out/bin/compiler_test.pl \
-      --replace '../$CONFIG_FILE' '$CONFIG_FILE'
+      --replace-fail '../compiler_test.pl' $out/bin/compiler_test.pl \
+      --replace-fail '../$CONFIG_FILE' '$CONFIG_FILE'
 
     wrapProgram $out/bin/launchn.pl \
       --prefix PERL5LIB : "$PERL5LIB"
@@ -72,4 +72,4 @@ stdenv.mkDerivation rec {
     maintainers = [ ];
     platforms = lib.platforms.all;
   };
-}
+})