diff --git a/core/thread.c b/core/thread.c
index cd97c38d60..cb828b6df4 100644
--- a/core/thread.c
+++ b/core/thread.c
@@ -178,9 +178,6 @@ uintptr_t measure_stack_free_internal(const char *stack, size_t size)
     uintptr_t *stackp = (uintptr_t *)(uintptr_t)stack;
     uintptr_t end = (uintptr_t)stack + size;
 
-    /* better be safe than sorry: align end of stack just in case */
-    end &= (sizeof(uintptr_t) - 1);
-
     /* assume that the stack grows "downwards" */
     while (((uintptr_t)stackp < end) && (*stackp == (uintptr_t)stackp)) {
         stackp++;