diff --git a/arch/mips/ath79/common.h b/arch/mips/ath79/common.h
index ca7cc19adfea..870c6b2e97e8 100644
--- a/arch/mips/ath79/common.h
+++ b/arch/mips/ath79/common.h
@@ -23,7 +23,6 @@ void ath79_clocks_init(void);
 unsigned long ath79_get_sys_clk_rate(const char *id);
 
 void ath79_ddr_ctrl_init(void);
-void ath79_ddr_wb_flush(unsigned int reg);
 
 void ath79_gpio_init(void);
 
diff --git a/arch/mips/include/asm/mach-ath79/ath79.h b/arch/mips/include/asm/mach-ath79/ath79.h
index 4eee221b0cf0..2b3487213d1e 100644
--- a/arch/mips/include/asm/mach-ath79/ath79.h
+++ b/arch/mips/include/asm/mach-ath79/ath79.h
@@ -115,6 +115,7 @@ static inline int soc_is_qca955x(void)
 	return soc_is_qca9556() || soc_is_qca9558();
 }
 
+void ath79_ddr_wb_flush(unsigned int reg);
 void ath79_ddr_set_pci_windows(void);
 
 extern void __iomem *ath79_pll_base;