diff --git a/sim/rx/ChangeLog b/sim/rx/ChangeLog
index 7541c9d7141..633ed86780c 100644
--- a/sim/rx/ChangeLog
+++ b/sim/rx/ChangeLog
@@ -1,3 +1,7 @@
+2021-05-01  Mike Frysinger  <vapier@gentoo.org>
+
+	* load.c (rx_load): Cast size to long.
+
 2021-04-26  Mike Frysinger  <vapier@gentoo.org>
 
 	* Makefile.in (NL_TARGET): Delete.
diff --git a/sim/rx/load.c b/sim/rx/load.c
index a8a473346c6..b4523e12ac7 100644
--- a/sim/rx/load.c
+++ b/sim/rx/load.c
@@ -151,7 +151,7 @@ rx_load (bfd *prog, host_callback *callback)
 	}
       if (bfd_bread (buf, size, prog) != size)
 	{
-	  fprintf (stderr, "Failed to read %lx bytes\n", size);
+	  fprintf (stderr, "Failed to read %lx bytes\n", (long) size);
 	  continue;
 	}