diff --git a/platform/targets/MD-UV3x0/platform.c b/platform/targets/MD-UV3x0/platform.c
index c1d7bd49..343ca14b 100644
--- a/platform/targets/MD-UV3x0/platform.c
+++ b/platform/targets/MD-UV3x0/platform.c
@@ -42,7 +42,7 @@ void platform_init()
     gpio_setMode(RED_LED,   OUTPUT);
 
     gpio_setMode(PTT_SW, INPUT_PULL_UP);
-    gpio_setMode(PTT_EXT, INPUT);
+    gpio_setMode(PTT_EXT, INPUT_PULL_UP);
 
     /*
      * Initialise ADC1, for vbat, RSSI, ...