diff --git a/src/fwidget.cpp b/src/fwidget.cpp
index 579fb045..eb35a68f 100644
--- a/src/fwidget.cpp
+++ b/src/fwidget.cpp
@@ -72,10 +72,10 @@ FWidget::FWidget (FWidget* parent) : FObject(parent)
     this->ymin = parent->client_ymin;
     this->xmax = parent->client_xmax;
     this->ymax = parent->client_ymax;
-    double_flatline_mask.top.resize (width, false);
-    double_flatline_mask.right.resize (height, false);
-    double_flatline_mask.bottom.resize (width, false);
-    double_flatline_mask.left.resize (height, false);
+    double_flatline_mask.top.resize (uLong(width), false);
+    double_flatline_mask.right.resize (uLong(height), false);
+    double_flatline_mask.bottom.resize (uLong(width), false);
+    double_flatline_mask.left.resize (uLong(height), false);
   }
 }
 
@@ -132,10 +132,10 @@ void FWidget::init()
                                    width, height );
   adjustWidgetSizeGlobalShadow = adjustWidgetSizeGlobal;
 
-  double_flatline_mask.top.resize (width, false);
-  double_flatline_mask.right.resize (height, false);
-  double_flatline_mask.bottom.resize (width, false);
-  double_flatline_mask.left.resize (height, false);
+  double_flatline_mask.top.resize (uLong(width), false);
+  double_flatline_mask.right.resize (uLong(height), false);
+  double_flatline_mask.bottom.resize (uLong(width), false);
+  double_flatline_mask.left.resize (uLong(height), false);
 
   // default widget colors
   setColorTheme();
@@ -1176,10 +1176,10 @@ void FWidget::resize()
   }
   else
     adjustSize();
-  double_flatline_mask.top.resize (width, false);
-  double_flatline_mask.right.resize (height, false);
-  double_flatline_mask.bottom.resize (width, false);
-  double_flatline_mask.left.resize (height, false);
+  double_flatline_mask.top.resize (uLong(width), false);
+  double_flatline_mask.right.resize (uLong(height), false);
+  double_flatline_mask.bottom.resize (uLong(width), false);
+  double_flatline_mask.left.resize (uLong(height), false);
 }
 
 //----------------------------------------------------------------------
@@ -1445,8 +1445,8 @@ void FWidget::setWidth (int w, bool adjust)
   if ( adjust )
     adjustSize();
 
-  double_flatline_mask.top.resize (width, false);
-  double_flatline_mask.bottom.resize (width, false);
+  double_flatline_mask.top.resize (uLong(width), false);
+  double_flatline_mask.bottom.resize (uLong(width), false);
 }
 
 //----------------------------------------------------------------------
@@ -1466,8 +1466,8 @@ void FWidget::setHeight (int h, bool adjust)
   if ( adjust )
     adjustSize();
 
-  double_flatline_mask.right.resize (height, false);
-  double_flatline_mask.left.resize (height, false);
+  double_flatline_mask.right.resize (uLong(height), false);
+  double_flatline_mask.left.resize (uLong(height), false);
 }
 
 //----------------------------------------------------------------------
@@ -1592,10 +1592,10 @@ void FWidget::setGeometry (int x, int y, int w, int h, bool adjust)
   if ( adjust )
     adjustSize();
 
-  double_flatline_mask.top.resize (width, false);
-  double_flatline_mask.right.resize (height, false);
-  double_flatline_mask.bottom.resize (width, false);
-  double_flatline_mask.left.resize (height, false);
+  double_flatline_mask.top.resize (uLong(width), false);
+  double_flatline_mask.right.resize (uLong(height), false);
+  double_flatline_mask.bottom.resize (uLong(width), false);
+  double_flatline_mask.left.resize (uLong(height), false);
 }
 
 //----------------------------------------------------------------------
@@ -1893,7 +1893,7 @@ void FWidget::drawFlatBorder()
   for (int y=0; y < height; y++)
   {
     gotoxy (x1-1, y1+y+1);
-    if ( double_flatline_mask.left[y] )
+    if ( double_flatline_mask.left[uLong(y)] )
       print (fc::NF_rev_border_line_right); // || is not yet defined
     else
       print (fc::NF_rev_border_line_right); // right line (on left side)
@@ -1902,7 +1902,7 @@ void FWidget::drawFlatBorder()
   gotoxy (x2, y1+1);
   for (int y=0; y < height; y++)
   {
-    if ( double_flatline_mask.right[y] )
+    if ( double_flatline_mask.right[uLong(y)] )
       print (fc::NF_border_line_left); // || is not yet defined
     else
       print (fc::NF_border_line_left); // left line (on right side)
@@ -1912,7 +1912,7 @@ void FWidget::drawFlatBorder()
   gotoxy (x1, y1);
   for (int x=0; x < width; x++)
   {
-    if ( double_flatline_mask.top[x] )
+    if ( double_flatline_mask.top[uLong(x)] )
       print (fc::NF_border_line_up_and_down); // top+bottom line (at top)
     else
       print (fc::NF_border_line_bottom); // bottom line (at top)
@@ -1921,7 +1921,7 @@ void FWidget::drawFlatBorder()
   gotoxy (x1, y2);
   for (int x=0; x < width; x++)
   {
-    if ( double_flatline_mask.bottom[x] )
+    if ( double_flatline_mask.bottom[uLong(x)] )
       print (fc::NF_border_line_up_and_down); // top+bottom line (at bottom)
     else
       print (fc::NF_border_line_upper); // top line (at bottom)
@@ -1967,7 +1967,7 @@ void FWidget::clearFlatBorder()
 //----------------------------------------------------------------------
 void FWidget::setDoubleFlatLine(int side, bool bit)
 {
-  int size;
+  uLong size;
 
   assert (  side == fc::top
          || side == fc::right
@@ -1997,6 +1997,7 @@ void FWidget::setDoubleFlatLine(int side, bool bit)
       break;
   }
 }
+
 //----------------------------------------------------------------------
 std::vector<bool>& FWidget::doubleFlatLine_ref(int side)
 {