diff --git a/src/core/libraries/kernel/threads/pthread.cpp b/src/core/libraries/kernel/threads/pthread.cpp
index 2858375b1..eca81c6c0 100644
--- a/src/core/libraries/kernel/threads/pthread.cpp
+++ b/src/core/libraries/kernel/threads/pthread.cpp
@@ -208,7 +208,7 @@ static void RunThread(void* arg) {
 
     /* Run the current thread's start routine with argument: */
     auto* const stack =
-        (void*)((size_t)curthread->attr.stackaddr_attr + curthread->attr.stacksize_attr);
+        (void*)(((size_t)curthread->attr.stackaddr_attr + curthread->attr.stacksize_attr) & (~15));
     void* ret = _runOnAnotherStack(curthread->arg, (void*)curthread->start_routine, stack);
 
     /* Remove thread from tracking */