diff --git a/pkgs/tools/networking/nmh/default.nix b/pkgs/tools/networking/nmh/default.nix
index 23c3efbbf313..e32da2708a5b 100644
--- a/pkgs/tools/networking/nmh/default.nix
+++ b/pkgs/tools/networking/nmh/default.nix
@@ -52,6 +52,7 @@ stdenv.mkDerivation (finalAttrs: {
     readline
   ];
 
+  NIX_CFLAGS_COMPILE = "-Wno-stringop-truncation";
   doCheck = true;
   enableParallelBuilding = true;