diff --git a/libjbig/jbig.c b/libjbig/jbig.c

index 751ceff..3c76e07 100644

--- a/libjbig/jbig.c

+++ b/libjbig/jbig.c

@@ -889,7 +889,7 @@ void jbg_enc_options(struct jbg_enc_state *s, int order, int options,

   if (order >= 0 && order <= 0x0f) s->order = order;

   if (options >= 0) s->options = options;

   if (l0 > 0) s->l0 = l0;

-  if (mx >= 0 && my < 128) s->mx = mx;

+  if (mx >= 0 && mx < 128) s->mx = mx;

   if (my >= 0 && my < 256) s->my = my;

   return;

diff --git a/pbmtools/Makefile b/pbmtools/Makefile

index 85e1783..6ae2d33 100644

--- a/pbmtools/Makefile

+++ b/pbmtools/Makefile

@@ -56,9 +56,9 @@ test82: pbmtojbg jbgtopbm

 	make IMG=sandra    "OPTIONSP=-o 2" OPTIONSJ=       dotest2g

 	make IMG=multi      OPTIONSP=      OPTIONSJ=       dotest2g

 	make IMG=multi      OPTIONSP=-b    OPTIONSJ=-b     dotest2g

-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest1

-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest2b

-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128 -p 92" dotest2b

+	make IMG=mx        "OPTIONSP=-q -s 3 -m 127"       dotest1

+	make IMG=mx        "OPTIONSP=-q -s 3 -m 127"       dotest2b

+	make IMG=mx        "OPTIONSP=-q -s 3 -m 127 -p 92" dotest2b

 	make IMG=mx        "OPTIONSP=-q -Y -1"             dotest2b

 	make IMG=mx        "OPTIONSP=-Y -1"                dotest2b

 	rm -f test-*.jbg test-*.pbm test-*.pgm