diff --git a/pkgs/applications/virtualization/virt-viewer/default.nix b/pkgs/applications/virtualization/virt-viewer/default.nix
index b11016ae65d..51ef6c5b39e 100644
--- a/pkgs/applications/virtualization/virt-viewer/default.nix
+++ b/pkgs/applications/virtualization/virt-viewer/default.nix
@@ -1,6 +1,6 @@
 x@{builderDefsPackage
   , gnome, gtk, glib, libxml2, pkgconfig, libvirt, gtkvnc, cyrus_sasl, libtasn1
-  , gnupg, libgcrypt, perl, nettle
+  , gnupg, libgcrypt, perl, nettle, yajl
   , ...}:
 builderDefsPackage
 (a :