diff --git a/lib/option.js b/lib/option.js
index ca240c1ae..8f24cf696 100644
--- a/lib/option.js
+++ b/lib/option.js
@@ -337,7 +337,7 @@ function splitOptionFlags(flags) {
   // Check for unprocessed flag. Fail noisily rather than silently ignore.
   if (flagParts[0].startsWith('-')) {
     const unsupportedFlag = flagParts[0];
-    const baseError = `option creation failed due to '${unsupportedFlag}' in option flags '${flags}':`;
+    const baseError = `option creation failed due to '${unsupportedFlag}' in option flags '${flags}'`;
     if (/^-[^-][^-]/.test(unsupportedFlag))
       throw new Error(
         `${baseError}