diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 24699ad69040..5544a7f88b40 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -21,7 +21,7 @@
 , libiconv, postgresql, v8_3_16_14, clang, sqlite, zlib, imagemagick
 , pkgconfig , ncurses, xapian, gpgme, utillinux, fetchpatch, tzdata, icu, libffi
 , cmake, libssh2, openssl, mysql, darwin, git, perl, gecode_3, curl
-, libmsgpack, qt5Full
+, libmsgpack, qt48
 }:
 
 let
@@ -30,7 +30,7 @@ in
 
 {
   capybara-webkit = attrs: {
-    buildInputs = [ qt5Full ];
+    buildInputs = [ qt48 ];
   };
 
   charlock_holmes = attrs: {