diff --git a/drivers/staging/rtl8188eu/core/rtw_rf.c b/drivers/staging/rtl8188eu/core/rtw_rf.c
index 6983c572b358..4ad2d8f63acf 100644
--- a/drivers/staging/rtl8188eu/core/rtw_rf.c
+++ b/drivers/staging/rtl8188eu/core/rtw_rf.c
@@ -70,20 +70,3 @@ u32 rtw_ch2freq(u32 channel)
 
 	return freq;
 }
-
-u32 rtw_freq2ch(u32 freq)
-{
-	u8	i;
-	u32	ch = 0;
-
-	for (i = 0; i < ch_freq_map_num; i++) {
-		if (freq == ch_freq_map[i].frequency) {
-			ch = ch_freq_map[i].channel;
-				break;
-		}
-	}
-	if (i == ch_freq_map_num)
-		ch = 1;
-
-	return ch;
-}
diff --git a/drivers/staging/rtl8188eu/include/rtw_rf.h b/drivers/staging/rtl8188eu/include/rtw_rf.h
index 2df88370de59..35f61be12acd 100644
--- a/drivers/staging/rtl8188eu/include/rtw_rf.h
+++ b/drivers/staging/rtl8188eu/include/rtw_rf.h
@@ -140,7 +140,6 @@ enum rt_rf_type_def {
 };
 
 u32 rtw_ch2freq(u32 ch);
-u32 rtw_freq2ch(u32 freq);
 
 
 #endif /* _RTL8711_RF_H_ */