1 files changed, 2 insertions, 2 deletions
diff --git a/src/sds.h b/src/sds.h
index 5080495..98124a5 100644
--- a/src/sds.h
+++ b/src/sds.h
@@ -42,12 +42,12 @@ struct sdshdr {
 };
 
 static inline size_t sdslen(const sds s) {
-    struct sdshdr *sh = (void*)(s-sizeof *sh);
+    struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
     return sh->len;
 }
 
 static inline size_t sdsavail(const sds s) {
-    struct sdshdr *sh = (void*)(s-sizeof *sh);
+    struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
     return sh->free;
 }