diff --git a/libzpaq/libzpaq.cpp b/libzpaq/libzpaq.cpp
index ea411f1..633c6f1 100644
--- a/libzpaq/libzpaq.cpp
+++ b/libzpaq/libzpaq.cpp
@@ -1458,23 +1458,23 @@ void Compressor::startBlock(int level) {
   // Model 2 - mid.cfg
   69,0,3,3,0,0,8,3,5,8,13,0,8,17,1,8,
   18,2,8,18,3,8,19,4,4,22,24,7,16,0,7,24,
-  -1,0,17,104,74,4,95,1,59,112,10,25,59,112,10,25,
+  (char)-1,0,17,104,74,4,95,1,59,112,10,25,59,112,10,25,
   59,112,10,25,59,112,10,25,59,112,10,25,59,10,59,112,
-  25,69,-49,8,112,56,0,
+  25,69,(char)-49,8,112,56,0,
 
   // Model 3 - max.cfg
-  -60,0,5,9,0,0,22,1,-96,3,5,8,13,1,8,16,
+  (char)-60,0,5,9,0,0,22,1,(char)-96,3,5,8,13,1,8,16,
   2,8,18,3,8,19,4,8,19,5,8,20,6,4,22,24,
   3,17,8,19,9,3,13,3,13,3,13,3,14,7,16,0,
-  15,24,-1,7,8,0,16,10,-1,6,0,15,16,24,0,9,
-  8,17,32,-1,6,8,17,18,16,-1,9,16,19,32,-1,6,
+  15,24,(char)-1,7,8,0,16,10,(char)-1,6,0,15,16,24,0,9,
+  8,17,32,(char)-1,6,8,17,18,16,(char)-1,9,16,19,32,(char)-1,6,
   0,19,20,16,0,0,17,104,74,4,95,2,59,112,10,25,
   59,112,10,25,59,112,10,25,59,112,10,25,59,112,10,25,
-  59,10,59,112,10,25,59,112,10,25,69,-73,32,-17,64,47,
-  14,-25,91,47,10,25,60,26,48,-122,-105,20,112,63,9,70,
-  -33,0,39,3,25,112,26,52,25,25,74,10,4,59,112,25,
-  10,4,59,112,25,10,4,59,112,25,65,-113,-44,72,4,59,
-  112,8,-113,-40,8,68,-81,60,60,25,69,-49,9,112,25,25,
+  59,10,59,112,10,25,59,112,10,25,69,(char)-73,32,(char)-17,64,47,
+  14,(char)-25,91,47,10,25,60,26,48,(char)-122,(char)-105,20,112,63,9,70,
+  (char)-33,0,39,3,25,112,26,52,25,25,74,10,4,59,112,25,
+  10,4,59,112,25,10,4,59,112,25,65,(char)-113,(char)-44,72,4,59,
+  112,8,(char)-113,(char)-40,8,68,(char)-81,60,60,25,69,(char)-49,9,112,25,25,
   25,25,25,112,56,0,
 
   0,0}; // 0,0 = end of list