diff --git a/ssh_tools/tabssh.sh b/ssh_tools/tabssh.sh
index ac3538d..ec7f6b4 100755
--- a/ssh_tools/tabssh.sh
+++ b/ssh_tools/tabssh.sh
@@ -18,6 +18,7 @@ set -u
 # Exit codes
 readonly EXIT_SUCCESS=0
 readonly EXIT_USAGE=127
+readonly EXIT_DEPENDENCY=4
 readonly EXIT_HOSTS_LIST=6
 
 print_usage()
@@ -54,6 +55,13 @@ elif [ $# -ne 1 ] ; then
   bad_usage "Wrong number of arguments."
 fi
 
+# Check dependencies
+SCREEN=$(command -v screen)
+if [ -z "$SCREEN" ] ; then
+  err "GNU screen is required by this script."
+  exit $EXIT_DEPENDENCY
+fi
+
 # Hosts list file
 [ -z ${XDG_CONFIG_HOME+x} ] && XDG_CONFIG_HOME="$HOME/.config"
 HOSTS_LIST_NAME="$1"
@@ -75,5 +83,5 @@ fi
 while read -r HOST ; do
   SSH="ssh ${LOGIN}${HOST}"
   # shellcheck disable=SC2086
-  screen -t "$SSH" $SSH
+  $SCREEN -t "$SSH" $SSH
 done <"$HOSTS"