diff --git a/sim/mips/ChangeLog b/sim/mips/ChangeLog
index 1e57fe5..28a33c7 100644
--- a/sim/mips/ChangeLog
+++ b/sim/mips/ChangeLog
@@ -1,5 +1,10 @@
 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
 	register_value to 0.
 
diff --git a/sim/mips/dv-tx3904sio.c b/sim/mips/dv-tx3904sio.c
index c81b2dd..d447014 100644
--- a/sim/mips/dv-tx3904sio.c
+++ b/sim/mips/dv-tx3904sio.c
@@ -582,7 +582,7 @@
   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);