diff --git a/include/expr.cpp b/include/expr.cpp
index b21308b23..78d2e1991 100755
--- a/include/expr.cpp
+++ b/include/expr.cpp
@@ -445,13 +445,13 @@ void TExpression::eval()
     case _left:
       o2 = (real&) evalstack.pop();
       s2 = (TString&) evalstack.pop();
-      s1 = s2.left(o2.integer());
+      s1 = s2.left((int)o2.integer());
       evalstack.push(s1);
       break;
     case _right:
       o2 = (real&) evalstack.pop();
       s2 = (TString&) evalstack.pop();
-      s1 = s2.right(o2.integer());
+      s1 = s2.right((int)o2.integer());
       evalstack.push(s1);
       break;
     case _mid:
@@ -459,7 +459,7 @@ void TExpression::eval()
       o1 = (real&) evalstack.pop();
       o1 -= 1.00;
       s2 = (TString&) evalstack.pop();
-      s1 = s2.mid(o1.integer(), o2.integer());
+      s1 = s2.mid((int)o1.integer(), (int)o2.integer());
       evalstack.push(s1);
       break;
     case _pow: