diff --git a/apps/plugins/chessbox/gnuchess.c b/apps/plugins/chessbox/gnuchess.c
index 5c30c6a..42ecdb5 100644
--- a/apps/plugins/chessbox/gnuchess.c
+++ b/apps/plugins/chessbox/gnuchess.c
@@ -2145,7 +2145,8 @@ short j,j1,j2,piece,i,sq,*PL;
while (!(m & 0x88))
{
u = unmap[m];
- a[u] = ++a[u] | c;
+ a[u] = a[u+1] | c;
+ a++;
if (color[u] == neutral) m += d;
else break;
}
@@ -2155,7 +2156,8 @@ short j,j1,j2,piece,i,sq,*PL;
if (!((m = m0+Dir[j]) & 0x88))
{
u = unmap[m];
- a[u] = ++a[u] | c;
+ a[u] = a[u+1] | c;
+ a++;
}
}
}