diff --git a/ef/ef0101.cpp b/ef/ef0101.cpp
index 054a6c2c0..a14b4beb9 100755
--- a/ef/ef0101.cpp
+++ b/ef/ef0101.cpp
@@ -136,7 +136,7 @@ int TEffetto::read(TLocalisamfile& f, const TRectype& rec, word lockop)
 }
 
 // legge l'effetto usando la chiave 4
-int TEffetto::read(TLocalisamfile& f, char tipodist, long ndist, int nrigadist)
+int TEffetto::read(TLocalisamfile& f, char tipodist, long ndist, int nrigadist, word lockop)
 {
   f.setkey(4);
   TRectype rec(LF_EFFETTI);
diff --git a/ef/ef0101.h b/ef/ef0101.h
index 4274dcff4..f9ad02e86 100755
--- a/ef/ef0101.h
+++ b/ef/ef0101.h
@@ -60,7 +60,7 @@ public:
   // legge il record passato, con chiave 1
   int read(TLocalisamfile& f, const TRectype& rec, word lockop = _nolock);
   // legge il record passato, con chiave 4
-  int read(TLocalisamfile& f, char tipodist, long ndist, int nrigadist);
+  int read(TLocalisamfile& f, char tipodist, long ndist, int nrigadist, word lockop = _nolock);
   // scrive l'effetto, sempre usando la chiave 1
   int write(TLocalisamfile& f, bool force = FALSE);
   // riscrive l'effetto