diff --git a/uart.c b/uart.c
index 2e5d353..5a6e0b5 100644
--- a/uart.c
+++ b/uart.c
@@ -113,7 +113,7 @@ void uart_putstr(const char *str)
 } /* uart_putstr */
 
 
-void uart_putstr_p (const prog_char *str)
+void uart_putstr_p (const char *str)
 {
     uint8_t c;
 
diff --git a/uart.h b/uart.h
index 0a6b040..aca55e9 100644
--- a/uart.h
+++ b/uart.h
@@ -11,7 +11,7 @@ void    uart_putc       (uint8_t data);
 uint8_t uart_getc       (void);
 uint8_t uart_rx_count   (void);
 void    uart_putstr     (const char *str);
-void    uart_putstr_p   (const prog_char *str);
+void    uart_putstr_p   (const char *str);
 
 void    uart_put_hex    (uint8_t data);
 uint8_t uart_get_hex    (void);