diff --git a/magick/threshold.c b/magick/threshold.c
index 7f149ee..98d89be 100644
--- a/magick/threshold.c
+++ b/magick/threshold.c
@@ -65,6 +65,7 @@
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/montage.h"
+#include "magick/option.h"
#include "magick/pixel-private.h"
#include "magick/quantize.h"
#include "magick/quantum.h"
@@ -76,9 +77,9 @@
#include "magick/shear.h"
#include "magick/signature-private.h"
#include "magick/string_.h"
+#include "magick/string-private.h"
#include "magick/transform.h"
#include "magick/threshold.h"
-#include "magick/option.h"
#include "magick/xml-tree.h"
/*
@@ -947,7 +948,7 @@
map = DestroyThresholdMap(map);
return(map);
}
- map->width = (unsigned long) atoi(attr);
+ map->width = (unsigned long) StringToLong(attr);
if ( map->width == 0 ) {
(void) ThrowMagickException(exception,GetMagickModule(),OptionError,
"XmlInvalidAttribute", "<levels width>, map \"%s\"", map_id);
@@ -964,7 +965,7 @@
map = DestroyThresholdMap(map);
return(map);
}
- map->height = (unsigned long) atoi(attr);
+ map->height = (unsigned long) StringToLong(attr);
if ( map->height == 0 ) {
(void) ThrowMagickException(exception,GetMagickModule(),OptionError,
"XmlInvalidAttribute", "<levels height>, map \"%s\"", map_id);
@@ -981,7 +982,7 @@
map = DestroyThresholdMap(map);
return(map);
}
- map->divisor = atoi(attr);
+ map->divisor = StringToLong(attr);
if ( map->divisor < 2 ) {
(void) ThrowMagickException(exception,GetMagickModule(),OptionError,
"XmlInvalidAttribute", "<levels divisor>, map \"%s\"", map_id);