diff --git a/samples/sample_arm.c b/samples/sample_arm.c
index ac25e598..40156890 100644
--- a/samples/sample_arm.c
+++ b/samples/sample_arm.c
@@ -264,13 +264,21 @@ static void test_thumb_mrs(void)
     // 0xf3ef8014 - mrs r0, control
 
     // Initialize emulator in ARM mode
-    err = uc_open(UC_ARCH_ARM, UC_MODE_THUMB | UC_MODE_MCLASS, &uc);
+    err = uc_open(UC_ARCH_ARM, UC_MODE_THUMB, &uc);
     if (err) {
         printf("Failed on uc_open() with error returned: %u (%s)\n", err,
                uc_strerror(err));
         return;
     }
 
+    // Setup the cpu model.
+    err = uc_ctl_set_cpu_model(uc, UC_CPU_ARM_CORTEX_M33);
+    if (err) {
+        printf("Failed on uc_ctl() with error returned: %u (%s)\n", err,
+               uc_strerror(err));
+        return;
+    }
+
     // map 2MB memory for this emulation
     uc_mem_map(uc, ADDRESS, 2 * 1024 * 1024, UC_PROT_ALL);