diff --git a/pkgs/development/libraries/libunwind/default.nix b/pkgs/development/libraries/libunwind/default.nix
index 3816788f929..7e481034f43 100644
--- a/pkgs/development/libraries/libunwind/default.nix
+++ b/pkgs/development/libraries/libunwind/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   # Without latex2man, no man pages are installed despite being
   # prebuilt in the source tarball.
-  configureFlags = "LATEX2MAN=${coreutils}/bin/true";
+  configureFlags = [ "LATEX2MAN=${coreutils}/bin/true" ];
 
   propagatedBuildInputs = [ xz ];