diff --git a/twain/twain/huagaods.cpp b/twain/twain/huagaods.cpp
index 3506316..8e80135 100644
--- a/twain/twain/huagaods.cpp
+++ b/twain/twain/huagaods.cpp
@@ -1795,6 +1795,7 @@ void huagao_ds::init_support_caps(void)
 
 			if (dup && count >= 2)
 			{
+				count++;
 				count /= 2;
 			}
 			SET_SANE_OPT_EX(ret, scanner_, scan_count, &count);
@@ -2361,12 +2362,12 @@ void huagao_ds::init_support_caps(void)
 
 		int ret = SCANNER_ERR_OK;
 		int count = count_;
-		if (dup && count_ >= 2)
+		if (dup && count >= 2)
 		{
 			count /= 2;
 			SET_SANE_OPT_EX(ret, scanner_, scan_count, &count);
 		}
-		else if (!dup && count_ >= 2)
+		else if (!dup && count >= 2)
 			SET_SANE_OPT_EX(ret, scanner_, scan_count, &count)
 
 		return CapSupGetAllReset<BYTE, Bool, CapType::DuplexEnabled>(msg, data, dup, Bool(true));