diff --git a/src/run.ts b/src/run.ts
index 2fd55d5..1484aa8 100644
--- a/src/run.ts
+++ b/src/run.ts
@@ -24,7 +24,7 @@ async function fetchPatch(): Promise<string> {
   if (onlyNewIssues !== `false` && onlyNewIssues !== `true`) {
     throw new Error(`invalid value of "only-new-issues": "${onlyNewIssues}", expected "true" or "false"`)
   }
-  if (onlyNewIssues === `false`) {
+  if (onlyNewIssues === `true`) {
     return ``
   }