diff --git a/build-aux/scripts/split.sh b/build-aux/scripts/split.sh
index 3b269aa..45c7ca5 100644
--- a/build-aux/scripts/split.sh
+++ b/build-aux/scripts/split.sh
@@ -4,6 +4,8 @@
 
 set -e
 
+if [ -z "$BASH" ]; then echo "Please run this script $0 with bash"; exit; fi
+
 CONFIG_FILE=/etc/vpnc/splitvpn
 RUNNING_FROM_OPENCONNECT=false