diff --git a/kernel/kernel.cc b/kernel/kernel.cc
index 5419de6aa645cbd3641406d3e6b2db4a075fb47f..576ca5a33264f8ff16693df72a50f0b57adbea2a 100644
--- a/kernel/kernel.cc
+++ b/kernel/kernel.cc
@@ -14,13 +14,13 @@ void main() {
         for(auto x = 0; x < 80; ++x) {
             char c = x%10 + '0';
             char color = x + y*80;
-            set_char(x, y, c, color);
+            set_char(x, y, ' ', 0x0f);
         }
     }
     print("Hello world!\n");
     print("Hello world!\n", 0xb1);
     print("Hello world!\n", 0xae);
     print("Hello world!\n", 0x5c);
-    print("Hello world!\n");
+    print("Hello world! This is recolic's test message, \n");
 }