diff --git a/variants/heltec_v3/variant.h b/variants/heltec_v3/variant.h
index aedfbe677..cb26ba0a3 100644
--- a/variants/heltec_v3/variant.h
+++ b/variants/heltec_v3/variant.h
@@ -4,6 +4,10 @@
 #define I2C_SDA SDA_OLED // I2C pins for this board
 #define I2C_SCL SCL_OLED
 
+// Enable secondary bus for external periherals
+#define I2C_SDA1 SDA
+#define I2C_SCL1 SCL
+
 #define VEXT_ENABLE Vext // active low, powers the oled display and the lora antenna boost
 #define BUTTON_PIN 0