Index: src/sort.c
===================================================================
--- src/sort.c.orig	2012-04-16 13:23:11.726363043 +0200
+++ src/sort.c	2012-04-16 13:23:20.474151036 +0200
@@ -3161,7 +3161,8 @@ keycompare_mb (const struct line *a, con
               if (MBLENGTH == (size_t)-2 || MBLENGTH == (size_t)-1)        \
                 STATE = state_bak;                                        \
               if (!ignore)                                                \
-                COPY[NEW_LEN++] = TEXT[i++];                                \
+                COPY[NEW_LEN++] = TEXT[i];                                \
+                i++;                                                      \
               continue;                                                        \
             }                                                                \
                                                                         \