--- rpl/src/instructions_b1.c	2013/03/10 22:15:48	1.43
+++ rpl/src/instructions_b1.c	2013/03/11 11:07:25	1.44
@@ -678,7 +678,8 @@ instruction_backspace(struct_processus *
 
 					for(i = 1; i < (nombre_octets - 1); i++)
 					{
-						saut |= tampon[i] << (((nombre_octets - 1) - i) * 8);
+						saut |= ((integer8) tampon[i]) <<
+								(((nombre_octets - 1) - i) * 8);
 					}
 				}