diff --git a/MagickWand/mogrify.c b/MagickWand/mogrify.c
index 5b2e4f3..a9cb15c 100644
--- a/MagickWand/mogrify.c
+++ b/MagickWand/mogrify.c
@@ -129,9 +129,11 @@
size_t
iterations,
- n,
number_threads;
+ ssize_t
+ n;
+
(void) setlocale(LC_ALL,"");
(void) setlocale(LC_NUMERIC,"C");
concurrent=MagickFalse;
@@ -175,7 +177,7 @@
}
number_threads=GetOpenMPMaximumThreads();
serial=0.0;
- for (n=1; n <= number_threads; n++)
+ for (n=1; n <= (ssize_t) number_threads; n++)
{
double
e,
@@ -185,7 +187,7 @@
TimerInfo
*timer;
- SetOpenMPMaximumThreads(n);
+ SetOpenMPMaximumThreads((int) n);
timer=AcquireTimerInfo();
if (concurrent == MagickFalse)
{