diff --git a/mg/mglib02.cpp b/mg/mglib02.cpp
index 420c97dc6..69fe03c4d 100755
--- a/mg/mglib02.cpp
+++ b/mg/mglib02.cpp
@@ -1323,7 +1323,7 @@ int TMov_mag::update_balances(TRectype & magrec, const TLine_movmag &l,int rett_
 
 void TMov_mag::update_balance(TRectype & magrec, const char * fieldname, real diff) const
 {
-  magrec.put(fieldname,magrec.get_int(fieldname)+diff);
+  magrec.put(fieldname,magrec.get_real(fieldname)+diff);
 }
 
 HIDDEN TEsercizi_contabili _esercizi;