2 files changed, 5 insertions, 2 deletions

diff --git a/lib/libc_r/uthread/uthread_write.c b/lib/libc_r/uthread/uthread_write.c
index 573e78e9e4d5..0b1e4a047cc3 100644
--- a/lib/libc_r/uthread/uthread_write.c
+++ b/lib/libc_r/uthread/uthread_write.c
@@ -78,7 +78,8 @@ _write(int fd, const void *buf, size_t nbytes)
 		 */
 		while (ret == 0) {
 			/* Perform a non-blocking write syscall: */
-			n = __sys_write(fd, buf + num, nbytes - num);
+			n = __sys_write(fd, (const char *)buf + num,
+			    nbytes - num);
 
 			/* Check if one or more bytes were written: */
 			if (n > 0)
diff --git a/lib/libc_r/uthread/uthread_writev.c b/lib/libc_r/uthread/uthread_writev.c
index 77046d574cfc..31d2b8cc1080 100644
--- a/lib/libc_r/uthread/uthread_writev.c
+++ b/lib/libc_r/uthread/uthread_writev.c
@@ -134,7 +134,9 @@ _writev(int fd, const struct iovec * iov, int iovcnt)
 						 * for the next write:
 						 */
 						p_iov[idx].iov_len -= cnt;
-						p_iov[idx].iov_base += cnt;
+						p_iov[idx].iov_base =
+						    (char *)p_iov[idx].iov_base
+						    + cnt;
 						cnt = 0;
 					}
 				}