diff --git a/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json b/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json
index de58d5137..4de59a093 100644
--- a/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json
+++ b/ui/src/assets/schema/provider/filebacked-http-reloading.schema.json
@@ -51,7 +51,7 @@
                 "refreshDelayFactor": {
                     "title": "label.refresh-delay-factor",
                     "description": "tooltip.refresh-delay-factor",
-                    "type": "number",
+                    "type": "string",
                     "widget": {
                         "id": "number",
                         "step": 0.01
@@ -59,7 +59,8 @@
                     "placeholder": "label.real-number",
                     "minimum": 0,
                     "maximum": 1,
-                    "default": null
+                    "default": null,
+                    "pattern": "^([0]*(\\.[0-9]+)?|[0]*\\.[0-9]*[1-9][0-9]*)$"
                 }
             }
         }