diff --git a/backend/src/main/resources/dynamic-http-metadata-provider.schema.json b/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
index 1969c9ab4..167e79ab1 100644
--- a/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
+++ b/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
@@ -117,15 +117,16 @@
                 "refreshDelayFactor": {
                     "title": "label.refresh-delay-factor",
                     "description": "tooltip.refresh-delay-factor",
-                    "type": "number",
+                    "type": "string",
                     "widget": {
                         "id": "number",
                         "step": 0.01
                     },
                     "placeholder": "label.real-number",
-                    "minimum": 0.01,
-                    "maximum": 0.99,
-                    "default": null
+                    "minimum": 0,
+                    "maximum": 1,
+                    "default": null,
+                    "pattern": "^([0]*(\\.[0-9]+)?|[0]*\\.[0-9]*[1-9][0-9]*)$"
                 },
                 "minCacheDuration": {
                     "title": "label.min-cache-duration",