diff --git a/examples/utest/testcases/kernel/irq_tc.c b/examples/utest/testcases/kernel/irq_tc.c
index 86b6c144f1..6d2a29f016 100644
--- a/examples/utest/testcases/kernel/irq_tc.c
+++ b/examples/utest/testcases/kernel/irq_tc.c
@@ -13,8 +13,8 @@
 #include "rthw.h"
 
 #define UTEST_NAME "irq_tc"
-static uint32_t irq_count = 0;
-static uint32_t max_get_nest_count = 0;
+static volatile uint32_t irq_count = 0;
+static volatile uint32_t max_get_nest_count = 0;
 
 static void irq_callback()
 {
diff --git a/examples/utest/testcases/kernel/thread_tc.c b/examples/utest/testcases/kernel/thread_tc.c
index 18ca465c50..74634adcc6 100644
--- a/examples/utest/testcases/kernel/thread_tc.c
+++ b/examples/utest/testcases/kernel/thread_tc.c
@@ -32,7 +32,7 @@ static volatile rt_uint32_t tid3_delay_pass_flag = 0;
 static volatile rt_uint32_t tid3_finish_flag = 0;
 static volatile rt_uint32_t tid4_finish_flag = 0;
 static volatile rt_uint32_t tid6_finish_flag = 0;
-static rt_uint32_t thread5_source = 0;
+static volatile rt_uint32_t thread5_source = 0;
 
 #ifndef RT_USING_SMP
     static rt_uint32_t thread_yield_flag = 0;