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-rw-r--r--mysys/mf_pack.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mysys/mf_pack.c b/mysys/mf_pack.c
index bed9968063a..d4828946d82 100644
--- a/mysys/mf_pack.c
+++ b/mysys/mf_pack.c
@@ -354,7 +354,7 @@ size_t unpack_dirname(char * to, const char *from)
length-= (size_t) (suffix-buff)-1;
if (length+(h_length= strlen(tilde_expansion)) <= FN_REFLEN)
{
- if (tilde_expansion[h_length-1] == FN_LIBCHAR)
+ if ((h_length > 0) && (tilde_expansion[h_length-1] == FN_LIBCHAR))
h_length--;
if (buff+h_length < suffix)
bmove(buff+h_length,suffix,length);