2 files changed, 3 insertions, 2 deletions

diff --git a/bootloader/common.c b/bootloader/common.c
index 362c3b4d11..1099b9f453 100644
--- a/bootloader/common.c
+++ b/bootloader/common.c
@@ -68,7 +68,7 @@ void reset_screen(void)
 #endif
 }
 
-void printf(const char *format, ...)
+int printf(const char *format, ...)
 {
     int len;
     unsigned char *ptr;
@@ -91,6 +91,7 @@ void printf(const char *format, ...)
     if(remote_line >= LCD_REMOTE_HEIGHT/SYSFONT_HEIGHT)
         remote_line = 0;
 #endif
+    return len;
 }
 
 char *strerror(int error)
diff --git a/bootloader/common.h b/bootloader/common.h
index 6713585ad8..7d5425c9c8 100644
--- a/bootloader/common.h
+++ b/bootloader/common.h
@@ -41,7 +41,7 @@ extern bool verbose;
 
 /* Functions common to all bootloaders */
 void reset_screen(void);
-void printf(const char *format, ...);
+int printf(const char *format, ...);
 char *strerror(int error);
 void error(int errortype, int error, bool shutdown);
 int load_firmware(unsigned char* buf, char* firmware, int buffer_size);