diff --git a/abstract-machine/klib/include/klib.h b/abstract-machine/klib/include/klib.h
index 5f279ef..ecb24c8 100644
--- a/abstract-machine/klib/include/klib.h
+++ b/abstract-machine/klib/include/klib.h
@@ -9,7 +9,7 @@
 extern "C" {
 #endif
 
-#define __NATIVE_USE_KLIB__
+//#define __NATIVE_USE_KLIB__
 
 // string.h
 void  *memset    (void *s, int c, size_t n);
diff --git a/abstract-machine/klib/src/printf.c b/abstract-machine/klib/src/printf.c
index 40764f1..d79f9d9 100644
--- a/abstract-machine/klib/src/printf.c
+++ b/abstract-machine/klib/src/printf.c
@@ -1,5 +1,7 @@
 #include <klib.h>
 
+#if !defined(__ISA_NATIVE__) || defined(__NATIVE_USE_KLIB__)
+
 int num_to_ascii(int num, int power, int size, char *buf) {
     if (size <= 1) {
         return 0;
@@ -80,3 +82,5 @@ int rvsnprintf(char* out, size_t n, const char* fmt, va_list ap) {
     *out = '\0';
     return ret;
 }
+
+#endif
\ No newline at end of file