diff --git a/src/keyboard/controller.c b/src/keyboard/controller.c
index 21ad56a..cc4492e 100644
--- a/src/keyboard/controller.c
+++ b/src/keyboard/controller.c
@@ -1357,7 +1357,7 @@ void usb_debug_flush_output(void) {
 
 void usb_debug_print(const char *s) {
   char c;
-  while ((c = pgm_read_byte(c))) {
+  while ((c = pgm_read_byte(s++))) {
     usb_debug_putchar(c);
   }
   usb_debug_flush_output();