diff --git a/pkgs/shells/fish/default.nix b/pkgs/shells/fish/default.nix
index 32d87d7cc1bf..df8b5d824f1e 100644
--- a/pkgs/shells/fish/default.nix
+++ b/pkgs/shells/fish/default.nix
@@ -102,7 +102,6 @@ let
 
     nativeBuildInputs = [ cmake ];
     buildInputs = [ ncurses libiconv pcre2 ];
-    cmakeFlags = [ "-DINTERNAL_WCWIDTH=OFF" ];
 
     preConfigure = ''
       patchShebangs ./build_tools/git_version_gen.sh