diff --git a/drivers/staging/winbond/phy_calibration.h b/drivers/staging/winbond/phy_calibration.h
index 84f6e840a47a..78fc68058607 100644
--- a/drivers/staging/winbond/phy_calibration.h
+++ b/drivers/staging/winbond/phy_calibration.h
@@ -79,6 +79,7 @@
 #define SHIFT_IQCAL_TONE_Q(x)	((x) >> 13)
 
 void phy_set_rf_data(struct hw_data *pHwData, u32 index, u32 value);
+void phy_calibration_winbond(struct hw_data *phw_data, u32 frequency);
 #define phy_init_rf(_A)		/* RFSynthesizer_initial(_A) */
 
 #endif
diff --git a/drivers/staging/winbond/wb35reg.c b/drivers/staging/winbond/wb35reg.c
index 4369be62f236..a5e255bb0f8b 100644
--- a/drivers/staging/winbond/wb35reg.c
+++ b/drivers/staging/winbond/wb35reg.c
@@ -1,10 +1,9 @@
 #include "wb35reg_f.h"
+#include "phy_calibration.h"
 
 #include <linux/usb.h>
 #include <linux/slab.h>
 
-extern void phy_calibration_winbond(struct hw_data *phw_data, u32 frequency);
-
 /*
  * true  : read command process successfully
  * false : register not support