diff --git a/variants/heltec_t1/variant.h b/variants/heltec_t1/variant.h
index 7ee21816..b52aeba0 100644
--- a/variants/heltec_t1/variant.h
+++ b/variants/heltec_t1/variant.h
@@ -25,8 +25,8 @@
 #define ST7735_SDA              (0 + 24)
 #define ST7735_SCK              (32 + 0)
 #define ST7735_RESET            (0 + 20)
-#define ST7735_MISO             (-1)
-#define ST7735_BUSY             (-1)
+#define ST7735_MISO             (0) // 0 maps to 0xff on this device which is NRFX_SPIM_PIN_NOT_USED
+#define ST7735_BUSY             (0) // 0 maps to 0xff on this device which is NRFX_SPIM_PIN_NOT_USED
 #define ST7735_BL               (0 + 15)
 #define VTFT_CTRL               (0 + 13)
 
@@ -66,8 +66,7 @@
 // UART
 
 // No longer populated on PCB.
-#define PIN_SERIAL2_RX          (-1)
-#define PIN_SERIAL2_TX          (-1)
+// Removed the pin definitions to avoid potential issues with Uart.
 
 ////////////////////////////////////////////////////////////////////////////////
 // I2C