diff --git a/resources/config_schema.json b/resources/config_schema.json
index 8db79296ca28e3d3f537892fe25903a978f66ea0..1ad78462f661002ea16af05cb95303286069b328 100644
--- a/resources/config_schema.json
+++ b/resources/config_schema.json
@@ -3,6 +3,7 @@
     "title": "Configuration schema",
     "required": ["samples", "output_dir", "log_dir", "kallisto_indexes", "salmon_indexes", "star_indexes", "alfa_indexes"],
     "type": "object",
+    "additionalProperties": false,
     "properties": {
       "samples": {
         "type": "string",