diff --git a/src/scriptlets/prevent-xhr.js b/src/scriptlets/prevent-xhr.js
index df20b479f..c11928bf0 100644
--- a/src/scriptlets/prevent-xhr.js
+++ b/src/scriptlets/prevent-xhr.js
@@ -152,8 +152,7 @@ export function preventXHR(source, propsToMatch, customResponseText) {
             if (randomText) {
                 modifiedResponseText = randomText;
             } else {
-                // FIXME: improve error text
-                logMessage(source, `Invalid range: ${customResponseText}`);
+                logMessage(source, `Invalid randomize parameter: '${customResponseText}'`);
             }
         }