diff --git a/check_inputs.sh b/check_inputs.sh
index 90595c0..bc5d4f1 100755
--- a/check_inputs.sh
+++ b/check_inputs.sh
@@ -4,6 +4,10 @@ set -o errexit  # abort on nonzero exit status
 set -o nounset  # abort on unbound variable
 set -o pipefail # don't hide errors within pipes
 
+if [[ $# -ne 2 ]]; then
+    echo "::error::Illegal number of parameters"
+fi
+
 IG_PUBLISHER_VERSION=$1
 SUSHI_VERSION=$2