diff --git a/code/nel/tools/misc/make_sheet_id/make_sheet_id.cpp b/code/nel/tools/misc/make_sheet_id/make_sheet_id.cpp
index a8e095db3..c6accc1cb 100644
--- a/code/nel/tools/misc/make_sheet_id/make_sheet_id.cpp
+++ b/code/nel/tools/misc/make_sheet_id/make_sheet_id.cpp
@@ -164,7 +164,9 @@ void readFormId( string& outputFileName )
 				map<string,uint8>::iterator itFT = FileTypeToId.find(fileType);
 				if( itFT == FileTypeToId.end() )
 				{
-					FileTypeToId.insert( std::pair<std::string, uint8>(fileType,fid.FormIDInfos.Type) );
+					uint8 type = (uint8)fid.FormIDInfos.Type;
+
+					FileTypeToId.insert( std::pair<std::string, uint8>(fileType, type) );
 				}
 			}
 			else