diff --git a/src/ve/velib04b.cpp b/src/ve/velib04b.cpp
index 656cccd63..acf6db639 100755
--- a/src/ve/velib04b.cpp
+++ b/src/ve/velib04b.cpp
@@ -1214,7 +1214,7 @@ error_type TContabilizzazione::compile_head_mov(TDocumento& doc)
 			{
 				TRegistro reg(registro);
 
-				ult_prot = registro.protocol();
+				ult_prot = reg.protocol();
 				ult_prot++;
 				if (ult_prot <= 0)
 				{