diff --git a/build-latest.sh b/build-latest.sh
index 54ebe36..3ddb607 100755
--- a/build-latest.sh
+++ b/build-latest.sh
@@ -4,6 +4,15 @@
 echo "▶️ $0 $*"
 
 ###
+# Check for the jq library needed for parsing JSON
+###
+if [ ! command -v jq &> /dev/null ]
+then
+    echo "⚠️ PRERELEASE must be either unset, 'true' or 'false', but was '${PRERELEASE}'!"
+    exit 1
+fi
+
+###
 # Checking for the presence of GITHUB_OAUTH_CLIENT_ID
 # and GITHUB_OAUTH_CLIENT_SECRET
 ###