diff --git a/arch/arm/include/asm/arch-stm32f7/stm32.h b/arch/arm/include/asm/arch-stm32f7/stm32.h
index 14e3398768..d4c834eedd 100644
--- a/arch/arm/include/asm/arch-stm32f7/stm32.h
+++ b/arch/arm/include/asm/arch-stm32f7/stm32.h
@@ -114,7 +114,6 @@ struct stm32_pwr_regs {
 };
 #define STM32_PWR		((struct stm32_pwr_regs *)PWR_BASE)
 
-int configure_clocks(void);
 unsigned long clock_get(enum clock clck);
 void stm32_flash_latency_cfg(int latency);
 
diff --git a/drivers/clk/clk_stm32f7.c b/drivers/clk/clk_stm32f7.c
index fcdc3c052b..aff8ad3bc7 100644
--- a/drivers/clk/clk_stm32f7.c
+++ b/drivers/clk/clk_stm32f7.c
@@ -104,7 +104,7 @@ struct pll_psc sys_pll_psc = {
 #endif
 #endif
 
-int configure_clocks(void)
+static int configure_clocks(void)
 {
 	/* Reset RCC configuration */
 	setbits_le32(&STM32_RCC->cr, RCC_CR_HSION);