diff --git a/deps/hiredis/sds.h b/deps/hiredis/sds.h
index 6f3201130..615c751cd 100644
--- a/deps/hiredis/sds.h
+++ b/deps/hiredis/sds.h
@@ -56,7 +56,7 @@ static inline size_t sdsavail(const sds s) {
 
 sds sdsnewlen(const void *init, size_t initlen);
 sds sdsnew(const char *init);
-sds sdsempty();
+sds sdsempty(void);
 size_t sdslen(const sds s);
 sds sdsdup(const sds s);
 void sdsfree(sds s);
diff --git a/src/sds.h b/src/sds.h
index 6f3201130..615c751cd 100644
--- a/src/sds.h
+++ b/src/sds.h
@@ -56,7 +56,7 @@ static inline size_t sdsavail(const sds s) {
 
 sds sdsnewlen(const void *init, size_t initlen);
 sds sdsnew(const char *init);
-sds sdsempty();
+sds sdsempty(void);
 size_t sdslen(const sds s);
 sds sdsdup(const sds s);
 void sdsfree(sds s);