diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index c123b6f..2e2554c 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -133,7 +133,9 @@
 
     /* reset does memset(0) up to here */
 
-    int cpu_num;
+    uint32_t cpu_num;
+    uint32_t machine_type;
+
     uint8_t *storage_keys;
 
     uint64_t tod_offset;
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index 97137c9..0c51917 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -3262,8 +3262,14 @@
 
 static ExitStatus op_stidp(DisasContext *s, DisasOps *o)
 {
+    TCGv_i64 t1 = tcg_temp_new_i64();
+
     check_privileged(s);
     tcg_gen_ld32u_i64(o->out, cpu_env, offsetof(CPUS390XState, cpu_num));
+    tcg_gen_ld32u_i64(t1, cpu_env, offsetof(CPUS390XState, machine_type));
+    tcg_gen_deposit_i64(o->out, o->out, t1, 32, 32);
+    tcg_temp_free_i64(t1);
+
     return NO_EXIT;
 }