diff --git a/src/hardwarecommunication/interrupts.cpp b/src/hardwarecommunication/interrupts.cpp
index 6ff5401..96475f3 100644
--- a/src/hardwarecommunication/interrupts.cpp
+++ b/src/hardwarecommunication/interrupts.cpp
@@ -5,7 +5,7 @@ using namespace myos::common;
 using namespace myos::hardwarecommunication;
 
 
-void printf(char* str);
+void printf(int8_t* str);
 void printfHex(uint8_t);
 
 
diff --git a/src/kernel.cpp b/src/kernel.cpp
index b0709dd..1a5f38d 100644
--- a/src/kernel.cpp
+++ b/src/kernel.cpp
@@ -35,7 +35,7 @@ using namespace myos::net;
 
 
 
-void printf(char* str)
+void printf(int8_t* str)
 {
     static uint16_t* VideoMemory = (uint16_t*)0xb8000;