diff --git a/nextflow_schema.json b/nextflow_schema.json
index d2e6b9a7..fd39fea4 100644
--- a/nextflow_schema.json
+++ b/nextflow_schema.json
@@ -625,6 +625,9 @@
                 },
                 "multiqc_logo": {
                     "type": "string",
+                    "format": "file-path",
+                    "exists": true,
+                    "mimetype": "text/plain",
                     "description": "Custom logo file to supply to MultiQC. File name must also be set in the MultiQC config file",
                     "fa_icon": "fas fa-image",
                     "hidden": true