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-rw-r--r--deflate.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/deflate.c b/deflate.c
index 7f2c8a2a2a64..00c6e05c7769 100644
--- a/deflate.c
+++ b/deflate.c
@@ -190,8 +190,11 @@ local const config configuration_table[10] = {
* prev[] will be initialized on the fly.
*/
#define CLEAR_HASH(s) \
- s->head[s->hash_size-1] = NIL; \
- zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
+ do { \
+ s->head[s->hash_size-1] = NIL; \
+ zmemzero((Bytef *)s->head, \
+ (unsigned)(s->hash_size-1)*sizeof(*s->head)); \
+ } while (0)
/* ===========================================================================
* Slide the hash table when sliding the window down (could be avoided with 32