diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index fd05615e76..82c4a3256a 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -6199,7 +6199,12 @@ write_relcache_init_file(bool shared)
 				 DatabasePath, RELCACHE_INIT_FILENAME);
 	}
 
-	unlink(tempfilename);		/* in case it exists w/wrong permissions */
+	/*
+	 * In case the temp file exists w/wrong permissions, call unlink() to remove it.
+	 * We don't check return value from unlink() because if unlink fails, the subsequent
+	 * AllocateFile() would fail to overwrite the file.
+	 */
+	unlink(tempfilename);
 
 	fp = AllocateFile(tempfilename, PG_BINARY_W);
 	if (fp == NULL)