diff --git a/pkgs/tools/networking/libreswan/default.nix b/pkgs/tools/networking/libreswan/default.nix
index 9a0b8c9ebf5..dd0137a1463 100644
--- a/pkgs/tools/networking/libreswan/default.nix
+++ b/pkgs/tools/networking/libreswan/default.nix
@@ -30,6 +30,7 @@ stdenv.mkDerivation {
     "-Wno-error=implicit-fallthrough"
     "-Wno-error=format-truncation"
     "-Wno-error=pointer-compare"
+    "-Wno-error=stringop-truncation"
   ];
 
   nativeBuildInputs = [ makeWrapper pkgconfig ];