diff --git a/variants/heltec_wireless_paper/variant.h b/variants/heltec_wireless_paper/variant.h
index 84c16c884..eb67ea816 100644
--- a/variants/heltec_wireless_paper/variant.h
+++ b/variants/heltec_wireless_paper/variant.h
@@ -1,5 +1,9 @@
 #define LED_PIN 18
 
+// Enable bus for external periherals
+#define I2C_SDA SDA
+#define I2C_SCL SCL
+
 #define USE_EINK
 /*
  * eink display pins
diff --git a/variants/heltec_wsl_v3/variant.h b/variants/heltec_wsl_v3/variant.h
index ec5796313..40671e4fb 100644
--- a/variants/heltec_wsl_v3/variant.h
+++ b/variants/heltec_wsl_v3/variant.h
@@ -1,5 +1,5 @@
-#define I2C_SCL 47
-#define I2C_SDA 48
+#define I2C_SCL SCL
+#define I2C_SDA SDA
 
 #define LED_PIN LED