diff --git a/pkgs/development/libraries/libiscsi/default.nix b/pkgs/development/libraries/libiscsi/default.nix
index 2f7e3c410dd8..246696c94ebe 100644
--- a/pkgs/development/libraries/libiscsi/default.nix
+++ b/pkgs/development/libraries/libiscsi/default.nix
@@ -13,6 +13,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ autoreconfHook ];
 
+  # This problem is gone on libiscsi master.
+  NIX_CFLAGS_COMPILE = if stdenv.hostPlatform.is32bit then "-Wno-error=sign-compare" else null;
+
   meta = with stdenv.lib; {
     description = "iscsi client library and utilities";
     homepage = "https://github.com/sahlberg/libiscsi";