diff --git a/loader.cc b/loader.cc
index 864a5b7d87df75d92119a93195604f0285b2ecf3..5e834c51778818807c0f2fb67f7211b810cb9c1c 100644
--- a/loader.cc
+++ b/loader.cc
@@ -1,6 +1,7 @@
 
 #include "drivers/isa-serial.hh"
 #include "fs/fs.hh"
+#include "net/net.hh"
 #include <boost/format.hpp>
 #include <cctype>
 #include "elf.hh"
@@ -144,6 +145,8 @@ int main(int ac, char **av)
 
     filesystem fs;
 
+    test_mbuf();
+
     disable_pic();
     processor::sti();
 
diff --git a/net/net.cc b/net/net.cc
index 548d5b5785339f9ec5d3cb3f8cb30b40b38798b2..4862a9ac39e1640f77f78d8e5d910344ab150971 100644
--- a/net/net.cc
+++ b/net/net.cc
@@ -1,3 +1,5 @@
+#include "debug.hh"
+
 extern "C" {
     #include "mbuf.h"
     #include "param.h"
@@ -7,5 +9,7 @@ extern void mbuf_init(void *dummy);
 
 void test_mbuf(void)
 {
+    debug("A");
     mbuf_init(NULL);
+    debug("B");
 }
diff --git a/net/net.hh b/net/net.hh
new file mode 100644
index 0000000000000000000000000000000000000000..a9a3ca1615cd899ed290fedac36fe3cdcb92b597
--- /dev/null
+++ b/net/net.hh
@@ -0,0 +1,8 @@
+#ifndef NET_HH
+#define NET_HH
+
+void test_mbuf(void);
+
+
+#endif // NET_HH
+