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-rw-r--r--mysys/my_bitmap.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mysys/my_bitmap.c b/mysys/my_bitmap.c
index 0c3f45be374..c89aec67da8 100644
--- a/mysys/my_bitmap.c
+++ b/mysys/my_bitmap.c
@@ -274,7 +274,10 @@ void bitmap_set_prefix(MY_BITMAP *map, uint prefix_size)
memset(m, 0xff, prefix_bytes);
m+= prefix_bytes;
if ((prefix_bits= prefix_size & 7))
+ {
*m++= (1 << prefix_bits)-1;
+ prefix_bytes++;
+ }
if ((d= no_bytes_in_map(map)-prefix_bytes))
bzero(m, d);
}