diff --git a/src/main.rb b/src/main.rb
index 75b384e..0960b45 100644
--- a/src/main.rb
+++ b/src/main.rb
@@ -74,7 +74,7 @@ end
 # rubocop:disable Metrics/MethodLength, Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
 def main_once
   chkrslts = []
-  (0..TRY_TIMES).each do
+  (0...TRY_TIMES).each do
     chkrslt = ServerStatusDetector::MinecraftServer.self_diag
     chkrslts.append(chkrslt)
   end