diff --git a/sim/rx/ChangeLog b/sim/rx/ChangeLog
index 71c73f0336..717816fb11 100644
--- a/sim/rx/ChangeLog
+++ b/sim/rx/ChangeLog
@@ -2,6 +2,8 @@
 
 	* fpu.c, gdb-if.c, load.c, misc.c, syscalls.c (config.h): Include.
 
+	* rx.c (decode_opcode): Declare `rx' as unsigned.
+
 2010-07-29  DJ Delorie  <dj@redhat.com>
 
 	* rx.c (decode_cache_base): New.
diff --git a/sim/rx/rx.c b/sim/rx/rx.c
index 1deef91656..fc12948bff 100644
--- a/sim/rx/rx.c
+++ b/sim/rx/rx.c
@@ -878,7 +878,7 @@ decode_opcode ()
   unsigned long long prev_cycle_count;
 #endif
 #ifdef CYCLE_ACCURATE
-  int tx;
+  unsigned int tx;
 #endif
 
 #ifdef CYCLE_STATS