diff --git a/pkgs/by-name/ob/obconf/package.nix b/pkgs/by-name/ob/obconf/package.nix
index 603879bfbe85..7d34f991361c 100644
--- a/pkgs/by-name/ob/obconf/package.nix
+++ b/pkgs/by-name/ob/obconf/package.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   postPatch = ''
-    substituteInPlace configure.ac --replace 2.0.4 ${finalAttrs.version}
+    substituteInPlace configure.ac --replace-fail 2.0.4 ${finalAttrs.version}
   '';
 
   meta = {