diff --git a/examples/elf/tests/mutex/mutex.c b/examples/elf/tests/mutex/mutex.c
index 9453f0d25..8621ef045 100644
--- a/examples/elf/tests/mutex/mutex.c
+++ b/examples/elf/tests/mutex/mutex.c
@@ -64,7 +64,7 @@ static volatile bool bendoftest;
 
 void thread_func(void *parameter)
 {
-  int my_id  = (int)((intptr_t)parameter;)
+  int my_id  = (int)((intptr_t)parameter);
   int my_ndx = my_id - 1;
   int i;