diff --git a/pkgs/by-name/ca/cairo/package.nix b/pkgs/by-name/ca/cairo/package.nix
index 163a15c9bfca..172deabc7149 100644
--- a/pkgs/by-name/ca/cairo/package.nix
+++ b/pkgs/by-name/ca/cairo/package.nix
@@ -99,11 +99,8 @@ stdenv.mkDerivation (
           {
             linux = "true";
             freebsd = "true";
-            netbsd = "false";
-            windows = "false";
           }
-          .${stdenv.hostPlatform.parsed.kernel.name}
-            or (throw "Unknown value for ipc_rmid_deferred_release on ${stdenv.hostPlatform.parsed.kernel.name}")
+          .${stdenv.hostPlatform.parsed.kernel.name} or "false"
         }
       ''}"
     ];