diff --git a/include/esp32-lora.h b/include/esp32-lora.h
index d501f54..22ebc8e 100644
--- a/include/esp32-lora.h
+++ b/include/esp32-lora.h
@@ -130,7 +130,7 @@ void lora32_dump_regs(lora32_cfg_t *lora);
 void lora32_enable_continuous_rx(lora32_cfg_t *lora);
 void lora32_enable_cad(lora32_cfg_t *lora);
 void lora32_send(lora32_cfg_t *config, uint8_t *data, uint8_t len);
-void lora32_set_coding_rate(lora32_cfg_t *lora, uint8_t d);
+void lora32_set_coding_rate(lora32_cfg_t *lora, uint8_t cr);
 void lora32_set_spreadfactor(lora32_cfg_t *lora, uint8_t factor);
 void lora32_read_data(lora32_cfg_t *lora, uint8_t *data);