diff --git a/waifu2x-caffe-gui/Source.cpp b/waifu2x-caffe-gui/Source.cpp
index 4341037..608eb96 100644
--- a/waifu2x-caffe-gui/Source.cpp
+++ b/waifu2x-caffe-gui/Source.cpp
@@ -308,7 +308,8 @@ private:
 			}
 		}
 
-		SendMessageA(hcrop, CB_ADDSTRING, 0, (LPARAM)"-----------------------");
+		if (SendMessageA(hcrop, CB_ADDSTRING, 0, (LPARAM)"-----------------------") == defaultIndex)
+			defaultIndex = 1;
 
 		// CropSizeListの値を追加していく
 		for (const auto n : CropSizeList)