diff --git a/packaging/deb/control b/packaging/deb/control
index 3cf8c9d3..15caa7a3 100644
--- a/packaging/deb/control
+++ b/packaging/deb/control
@@ -18,7 +18,7 @@ Description: Emulate virtual networks in a box.
 
 Package: core-gui
 Architecture: all
-Depends: bash (>=3.0), tcl (>= 8.5), tk (>= 8.5)
+Depends: bash (>=3.0), tcl (>= 8.5), tk (>= 8.5), xterm
 Recommends: libtk-img
 Description: Emulate virtual networks in a box.
  The Common Open Research Emulator provides Python modules for building virtual
diff --git a/packaging/rpm/core.spec.in b/packaging/rpm/core.spec.in
index 3ad71c69..ef15797c 100644
--- a/packaging/rpm/core.spec.in
+++ b/packaging/rpm/core.spec.in
@@ -47,7 +47,7 @@ networks using Linux network namespace containers and bridging.
 %package gui
 Summary:	Common Open Research Emulator GUI front-end
 Group:		System Tools
-Requires:	tcl tk
+Requires:	tcl tk xterm
 BuildArch:	noarch
 BuildRequires:  make automake autoconf
 Provides:	core-gui