diff --git a/sane/scanner.cpp b/sane/scanner.cpp
index a41c969..a9f90a5 100644
--- a/sane/scanner.cpp
+++ b/sane/scanner.cpp
@@ -1999,7 +1999,7 @@ EX_OPTION_HANDLER_IMPL(sharpen)
 	{
 		char* cur = (char*)hg_sane_middleware::instance()->get_cur_value(handle_, (void*)base_id),
 			* def = (char*)hg_sane_middleware::instance()->get_def_value(handle_, (void*)base_id);
-		int now = sane_opt_trans::multiout_value_to_twain(cur),
+		int now = sane_opt_trans::sharpen_to_twain(cur),
 			init = sane_opt_trans::sharpen_to_twain(def),
 			val = 0;