diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index cc0ef13..f087238 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -205,7 +205,13 @@ static inline int isdigit(int ch)
 extern char _end[];
 extern char *HEAP;
 extern char *heap_end;
-#define RESET_HEAP() ((void *)( HEAP = _end ))
+
+static inline void *RESET_HEAP(void)
+{
+	HEAP = _end;
+	memset(HEAP, 0, heap_end-HEAP);
+	return HEAP;
+}
 static inline char *__get_heap(size_t s, size_t a, size_t n)
 {
 	char *tmp;