diff --git a/second/MMU.h b/second/MMU.h
index 17e77fc..79492e1 100644
--- a/second/MMU.h
+++ b/second/MMU.h
@@ -20,7 +20,6 @@ void write_phys(void *addr, unsigned long value);
 extern unsigned long get_page_size(void);
 extern int logical2physicalAttr(unsigned long logical, unsigned long *physicalAddr, unsigned long *attr);
 extern int logical2physical(unsigned long logical, unsigned long *physicalAddr);
-#define TRACE_MMU
 #ifdef TRACE_MMU
 extern void MMU_set_trace(int enable);
 #endif