diff --git a/kernel/heap/src/lib.rs b/kernel/heap/src/lib.rs
index d5e9700d1c..9d93a8336a 100644
--- a/kernel/heap/src/lib.rs
+++ b/kernel/heap/src/lib.rs
@@ -89,7 +89,7 @@ unsafe impl GlobalAlloc for Heap {
     }
 
     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
-        if (ptr as usize) < INITIAL_HEAP_END_ADDR {
+        if KERNEL_HEAP_START <= (ptr as usize) && (ptr as usize) < INITIAL_HEAP_END_ADDR {
             self.initial_allocator.lock().deallocate(ptr, layout);
         }
         else {
diff --git a/kernel/panic_entry/src/lib.rs b/kernel/panic_entry/src/lib.rs
index 95dee82617..68a6416703 100644
--- a/kernel/panic_entry/src/lib.rs
+++ b/kernel/panic_entry/src/lib.rs
@@ -6,6 +6,7 @@
 
 #![no_std]
 #![feature(alloc_error_handler)]
+#![allow(internal_features)]
 #![feature(lang_items)]
 #![feature(panic_info_message)]
 
diff --git a/kernel/thread_local_macro/src/lib.rs b/kernel/thread_local_macro/src/lib.rs
index 91c03acc49..76ab879a0d 100644
--- a/kernel/thread_local_macro/src/lib.rs
+++ b/kernel/thread_local_macro/src/lib.rs
@@ -29,6 +29,7 @@
 
 #![no_std]
 #![feature(thread_local)]
+#![allow(internal_features)]
 #![feature(allow_internal_unstable)]
 
 // The code from Rust std uses unsafe blocks within unsafe functions,