diff --git a/src/core/alloc_func.hpp b/src/core/alloc_func.hpp
--- a/src/core/alloc_func.hpp
+++ b/src/core/alloc_func.hpp
@@ -90,4 +90,7 @@ template <typename T> FORCEINLINE T* Rea
 	return t_ptr;
 }
 
+/** alloca() has to be called in the parent function, so define AllocaM() as a macro */
+#define AllocaM(T, num_elements) ((T*)alloca((num_elements) * sizeof(T)))
+
 #endif /* ALLOC_FUNC_HPP */