diff --git a/sim/microblaze/ChangeLog b/sim/microblaze/ChangeLog
index c20e7c4a14..ac1d479e4f 100644
--- a/sim/microblaze/ChangeLog
+++ b/sim/microblaze/ChangeLog
@@ -1,3 +1,7 @@
+2021-04-01  Martin Liska  <mliska@suse.cz>
+
+	* interp.c (sim_engine_run): Use bool instead of int.
+
 2021-02-28  Mike Frysinger  <vapier@gentoo.org>
 
 	* configure: Regenerate.
diff --git a/sim/microblaze/interp.c b/sim/microblaze/interp.c
index 5b125a64da..8a9dbc3245 100644
--- a/sim/microblaze/interp.c
+++ b/sim/microblaze/interp.c
@@ -126,7 +126,7 @@ sim_engine_run (SIM_DESC sd,
   int cycs;
   word WLhash;
   ubyte carry;
-  int imm_unsigned;
+  bool imm_unsigned;
   short ra, rb, rd;
   long immword;
   uword oldpc, newpc;