Index: ball/include/BALL/DATATYPE/hashGrid.h
===================================================================
--- ball.orig/include/BALL/DATATYPE/hashGrid.h	2011-12-09 13:49:26.000000000 +0100
+++ ball/include/BALL/DATATYPE/hashGrid.h	2011-12-09 13:51:09.000000000 +0100
@@ -37,7 +37,7 @@
 {
 	namespace __private
 	{
-		extern const char BALL_EXPORT neighbour_table_[27][3];
+		extern const signed char BALL_EXPORT neighbour_table_[27][3];
 	}
 
 	template <typename Item> class HashGrid3;
Index: ball/source/DATATYPE/hashGrid.C
===================================================================
--- ball.orig/source/DATATYPE/hashGrid.C	2011-12-09 13:49:26.000000000 +0100
+++ ball/source/DATATYPE/hashGrid.C	2011-12-09 13:50:49.000000000 +0100
@@ -9,7 +9,7 @@
 {
 	namespace __private
 	{
-		const char neighbour_table_[27][3] =
+		const signed char neighbour_table_[27][3] =
 		{
 			{ 0,  0,  0 }, { 0,  0, -1 }, { 0,  0,  1 },
 			{ 0, -1, -1 }, { 0, -1,  0 }, { 0, -1,  1 },