diff --git a/pkgs/stdenv/adapters.nix b/pkgs/stdenv/adapters.nix
index 5e135524af9..e4f52924cf6 100644
--- a/pkgs/stdenv/adapters.nix
+++ b/pkgs/stdenv/adapters.nix
@@ -101,7 +101,7 @@ rec {
         NIX_CFLAGS_LINK = "-static";
 
         configureFlags =
-          (if args ? configureFlags then args.configureFlags else "")
+          (if args ? configureFlags then toString args.configureFlags else "")
           + " --disable-shared"; # brrr...
       });
       isStatic = true;