diff --git a/contrib/scripts/install_prereq b/contrib/scripts/install_prereq
index 2087a3c904ee310f5f765cdbfeff25877f97cabd..703cae2fe964029293360ce8f79dbad42c058347 100755
--- a/contrib/scripts/install_prereq
+++ b/contrib/scripts/install_prereq
@@ -26,7 +26,7 @@ PACKAGES_DEBIAN="$PACKAGES_DEBIAN libcurl-dev libspeex-dev libspeexdsp-dev libog
 # Asterisk: nice-to-have addons:
 PACKAGES_DEBIAN="$PACKAGES_DEBIAN libpq-dev unixodbc-dev libsqlite0-dev libsqlite3-dev libmysqlclient15-dev libneon27-dev libgmime-2.0-2-dev libusb-dev liblua5.1-0-dev"
 # Asterisk: other addons:
-PACKAGES_DEBIAN="$PACKAGES_DEBIAN libopenh323-dev libvpb-dev"
+PACKAGES_DEBIAN="$PACKAGES_DEBIAN libopenh323-dev libvpb-dev libgtk2.0-dev"
 # Extras for 1.4:
 PACKAGES_DEBIAN="$PACKAGES_DEBIAN libsnmp-dev libiksemel-dev "