diff --git a/sim/mips/ChangeLog b/sim/mips/ChangeLog
index 1e57fe54326..28a33c78995 100644
--- a/sim/mips/ChangeLog
+++ b/sim/mips/ChangeLog
@@ -1,3 +1,8 @@
+2021-06-16  Mike Frysinger  <vapier@gentoo.org>
+
+	* dv-tx3904sio.c (tx3904sio_fifo_push): Change next_buf to
+	unsigned_1.
+
 2021-06-16  Mike Frysinger  <vapier@gentoo.org>
 
 	* dv-tx3904irc.c (tx3904irc_io_write_buffer): Initialize
diff --git a/sim/mips/dv-tx3904sio.c b/sim/mips/dv-tx3904sio.c
index c81b2dd3a5e..d447014014c 100644
--- a/sim/mips/dv-tx3904sio.c
+++ b/sim/mips/dv-tx3904sio.c
@@ -582,7 +582,7 @@ tx3904sio_fifo_push(struct hw* me, struct tx3904sio_fifo* fifo, char it)
   if(fifo->size == fifo->used) /* full */
     {
       int next_size = fifo->size * 2 + 16;
-      char* next_buf = zalloc(next_size);
+      unsigned_1* next_buf = zalloc(next_size);
       memcpy(next_buf, fifo->buffer, fifo->used);
 
       if(fifo->buffer != NULL) free(fifo->buffer);