diff --git a/examples/elf/tests/mutex/mutex.c b/examples/elf/tests/mutex/mutex.c
index 0d5ff1d2a..9cc8f5f39 100644
--- a/examples/elf/tests/mutex/mutex.c
+++ b/examples/elf/tests/mutex/mutex.c
@@ -73,7 +73,7 @@ void thread_func(void *parameter)
    * 2 seconds by setting bendoftest in any event.
    */
 
-  for (i = 0; i < 20 && !bendoftest; i++);
+  for (i = 0; i < 20 && !bendoftest; i++)
     {
       if ((pthread_mutex_lock(&mut)) != 0)
         {
diff --git a/examples/nxflat/tests/mutex/mutex.c b/examples/nxflat/tests/mutex/mutex.c
index c15b2512a..554b3301a 100644
--- a/examples/nxflat/tests/mutex/mutex.c
+++ b/examples/nxflat/tests/mutex/mutex.c
@@ -73,7 +73,7 @@ void thread_func(void *parameter)
    * 2 seconds by setting bendoftest in any event.
    */
 
-  for (i = 0; i < 20 && !bendoftest; i++);
+  for (i = 0; i < 20 && !bendoftest; i++)
     {
       if ((pthread_mutex_lock(&mut)) != 0)
         {
diff --git a/examples/ostest/mutex.c b/examples/ostest/mutex.c
index 2ee637488..65b90c4b9 100644
--- a/examples/ostest/mutex.c
+++ b/examples/ostest/mutex.c
@@ -76,6 +76,7 @@ static void *thread_func(FAR void *parameter)
         {
           pthread_yield();
         }
+
       my_mutex = 0;
 
       status = pthread_mutex_unlock(&mut);