diff --git a/src/misc.c b/src/misc.c
index e02f60fc..a61f126c 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -744,7 +744,7 @@ int _libssh2_get_u32(struct string_buf *buf, uint32_t *out)
     return 0;
 }
 
-int _libssh2_get_u64(struct string_buf *buf, uint64_t *out)
+int _libssh2_get_u64(struct string_buf *buf, libssh2_uint64_t *out)
 {
        if (!_libssh2_check_length(buf, 8)) {
                return -1;
@@ -753,7 +753,7 @@ int _libssh2_get_u64(struct string_buf *buf, uint64_t *out)
        unsigned char *p = buf->dataptr;
        *out = _libssh2_ntohu64(p);
        buf->dataptr += 8;
-       buf->offset -= 8;
+       buf->offset += 8;
        return 0;
 }
 
diff --git a/src/misc.h b/src/misc.h
index d569c921..de249dbd 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -91,7 +91,7 @@ void _libssh2_explicit_zero(void *buf, size_t size);
 struct string_buf* _libssh2_string_buf_new(LIBSSH2_SESSION *session);
 void _libssh2_string_buf_free(LIBSSH2_SESSION *session, struct string_buf *buf);
 int _libssh2_get_u32(struct string_buf *buf, uint32_t *out);
-int _libssh2_get_u64(struct string_buf *buf, uint64_t *out);
+int _libssh2_get_u64(struct string_buf *buf, libssh2_uint64_t *out);
 int _libssh2_match_string(struct string_buf *buf, const char *match);
 int _libssh2_get_c_string(struct string_buf *buf, unsigned char **outbuf);
 int _libssh2_get_bignum_bytes(struct string_buf *buf, unsigned char **outbuf);