diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart.c b/arch/arm/mach-uniphier/debug-uart/debug-uart.c
index 6836eb63bfa..1a3e290aa97 100644
--- a/arch/arm/mach-uniphier/debug-uart/debug-uart.c
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart.c
@@ -16,7 +16,7 @@
 #define UNIPHIER_UART_LSR		0x14
 #define UNIPHIER_UART_LDR		0x24
 
-static void _debug_uart_putc(int c)
+static inline void _debug_uart_putc(int c)
 {
 	void __iomem *base = (void __iomem *)CONFIG_VAL(DEBUG_UART_BASE);