diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 846305fa130..8656a3c0ef0 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -209,6 +209,7 @@ in
       "-Wno-error=cast-function-type"
       "-Wno-error=class-memaccess"
       "-Wno-error=ignored-qualifiers"
+      "-Wno-error=tautological-compare"
     ];
     dontBuild = false;
     postPatch = ''