diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 6275a11a0c8c28b530c6897196172ea0c627083e..6433844f1800e114116905e57d9ca18b22ba98b2 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -257,7 +257,7 @@ int NS16550_tstc(NS16550_t com_port)
 			(1 << CONFIG_DEBUG_UART_SHIFT), \
 		CONFIG_DEBUG_UART_SHIFT)
 
-void debug_uart_init(void)
+static inline void _debug_uart_init(void)
 {
 	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
 	int baud_divisor;
diff --git a/drivers/serial/serial_efi.c b/drivers/serial/serial_efi.c
index cf57d8977b527b8e30989e6d90151bd24673a726..ea25c25a68e05737f456bcf31549addffa9a504a 100644
--- a/drivers/serial/serial_efi.c
+++ b/drivers/serial/serial_efi.c
@@ -107,7 +107,7 @@ static int serial_efi_pending(struct udevice *dev, bool input)
  * There is nothing to init here since the EFI console is already running by
  * the time we enter U-Boot.
  */
-void debug_uart_init(void)
+static inline void _debug_uart_init(void)
 {
 }
 
diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c
index 3f0b5882541bfe9a320e01972af6ff4c1e095d58..feba467d809452447f07bd2973621d4cb945baa0 100644
--- a/drivers/serial/serial_s5p.c
+++ b/drivers/serial/serial_s5p.c
@@ -207,7 +207,7 @@ U_BOOT_DRIVER(serial_s5p) = {
 
 #include <debug_uart.h>
 
-void debug_uart_init(void)
+static inline void _debug_uart_init(void)
 {
 	struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
 
diff --git a/include/debug_uart.h b/include/debug_uart.h
index a75e377dc0fab36a48bffbe0972b3388dc626941..257ba004d6e9d3858254625eb0cd40ba38a6d485 100644
--- a/include/debug_uart.h
+++ b/include/debug_uart.h
@@ -38,7 +38,7 @@
  * To enable the debug UART in your serial driver:
  *
  * - #include <debug_uart.h>
- * - Define debug_uart_init(), trying to avoid using the stack
+ * - Define _debug_uart_init(), trying to avoid using the stack
  * - Define _debug_uart_putc() as static inline (avoiding stack usage)
  * - Immediately afterwards, add DEBUG_UART_FUNCS to define the rest of the
  *     functionality (printch(), etc.)
@@ -132,6 +132,11 @@ void printhex8(uint value);
 	void printhex8(uint value) \
 	{ \
 		printhex(value, 8); \
-	}
+	} \
+\
+	void debug_uart_init(void) \
+	{ \
+		_debug_uart_init(); \
+	} \
 
 #endif
diff --git a/lib/efi/efi_stub.c b/lib/efi/efi_stub.c
index d4d3e496899fafe201416e9f1a24712cb9653cf5..e13870931e9be33421e2af62fa1917ee7aeded11 100644
--- a/lib/efi/efi_stub.c
+++ b/lib/efi/efi_stub.c
@@ -59,7 +59,7 @@ struct __packed desctab_info {
  * considering if we start needing more U-Boot functionality. Note that we
  * could then move get_codeseg32() to arch/x86/cpu/cpu.c.
  */
-void debug_uart_init(void)
+void _debug_uart_init(void)
 {
 }