diff --git a/sys/cpp_new_delete/new_delete.cpp b/sys/cpp_new_delete/new_delete.cpp
index 28a78c0d34..5af6180257 100644
--- a/sys/cpp_new_delete/new_delete.cpp
+++ b/sys/cpp_new_delete/new_delete.cpp
@@ -33,7 +33,7 @@ void *operator new(size_t size, void *ptr) noexcept {
     return ptr;
 }
 
-void operator delete(void *ptr) {
+void operator delete(void *ptr) noexcept {
     free(ptr);
 }
 
@@ -41,7 +41,7 @@ void operator delete(void *ptr, size_t) noexcept {
     free(ptr);
 }
 
-void operator delete[](void *ptr) {
+void operator delete[](void *ptr) noexcept {
     free(ptr);
 }