diff --git a/drivers/ng_at86rf2xx/ng_at86rf2xx_getset.c b/drivers/ng_at86rf2xx/ng_at86rf2xx_getset.c
index e89a1bcc7..d4bf9ea4b 100644
--- a/drivers/ng_at86rf2xx/ng_at86rf2xx_getset.c
+++ b/drivers/ng_at86rf2xx/ng_at86rf2xx_getset.c
@@ -29,22 +29,24 @@
 #include "debug.h"
 
 #ifdef MODULE_NG_AT86RF212B
+/* See: Table 9-15. Recommended Mapping of TX Power, Frequency Band, and
+ * PHY_TX_PWR (register 0x05), AT86RF212B data sheet. */
 static const uint8_t dbm_to_tx_pow_868[] = {0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18,
-                                        0x17, 0x15, 0x14, 0x13, 0x12, 0x11,
-                                        0x10, 0x0f, 0x31, 0x30, 0x2f, 0x94,
-                                        0x93, 0x91, 0x90, 0x29, 0x49, 0x48,
-                                        0x47, 0xad, 0xcd, 0xcc, 0xcb, 0xea,
-                                        0xe9, 0xe8, 0xe7, 0xe6, 0xe4, 0x80,
-                                        0xa0};
+                                            0x17, 0x15, 0x14, 0x13, 0x12, 0x11,
+                                            0x10, 0x0f, 0x31, 0x30, 0x2f, 0x94,
+                                            0x93, 0x91, 0x90, 0x29, 0x49, 0x48,
+                                            0x47, 0xad, 0xcd, 0xcc, 0xcb, 0xea,
+                                            0xe9, 0xe8, 0xe7, 0xe6, 0xe4, 0x80,
+                                            0xa0};
 static const uint8_t dbm_to_tx_pow_915[] = {0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x17,
-                                        0x16, 0x15, 0x14, 0x13, 0x12, 0x11,
-                                        0x10, 0x0f, 0x0e, 0x0d, 0x0c, 0x0b,
-                                        0x09, 0x91, 0x08, 0x07, 0x05, 0x27,
-                                        0x04, 0x03, 0x02, 0x01, 0x00, 0x86,
-                                        0x40, 0x84, 0x83, 0x82, 0x80, 0xc1,
-                                        0xc0};
+                                            0x16, 0x15, 0x14, 0x13, 0x12, 0x11,
+                                            0x10, 0x0f, 0x0e, 0x0d, 0x0c, 0x0b,
+                                            0x09, 0x91, 0x08, 0x07, 0x05, 0x27,
+                                            0x04, 0x03, 0x02, 0x01, 0x00, 0x86,
+                                            0x40, 0x84, 0x83, 0x82, 0x80, 0xc1,
+                                            0xc0};
 int16_t tx_pow_to_dbm(ng_at86rf2xx_freq_t freq, uint8_t reg) {
-    for(int i = 0; i < 38; i++){
+    for(int i = 0; i < 37; i++){
         if(freq == NG_AT86RF2XX_FREQ_868MHZ){
             if (dbm_to_tx_pow_868[i] == reg) {
                 return i -25;