diff --git a/src/main/drivers/adc_stm32f30x.c b/src/main/drivers/adc_stm32f30x.c
index b6b77595e..68f1177b5 100644
--- a/src/main/drivers/adc_stm32f30x.c
+++ b/src/main/drivers/adc_stm32f30x.c
@@ -91,14 +91,16 @@ void adcInit(drv_adc_config_t *init)
 #endif
 
 #ifdef EXTERNAL1_ADC_GPIO
-    GPIO_InitStructure.GPIO_Pin   = EXTERNAL1_ADC_GPIO_PIN;
-    GPIO_Init(EXTERNAL1_ADC_GPIO, &GPIO_InitStructure);
+    if (init->enableExternal1) {
+        GPIO_InitStructure.GPIO_Pin   = EXTERNAL1_ADC_GPIO_PIN;
+        GPIO_Init(EXTERNAL1_ADC_GPIO, &GPIO_InitStructure);
 
-    adcConfig[ADC_EXTERNAL1].adcChannel = EXTERNAL1_ADC_CHANNEL;
-    adcConfig[ADC_EXTERNAL1].dmaIndex = adcChannelCount;
-    adcConfig[ADC_EXTERNAL1].sampleTime = ADC_SampleTime_601Cycles5;
-    adcConfig[ADC_EXTERNAL1].enabled = true;
-    adcChannelCount++;
+        adcConfig[ADC_EXTERNAL1].adcChannel = EXTERNAL1_ADC_CHANNEL;
+        adcConfig[ADC_EXTERNAL1].dmaIndex = adcChannelCount;
+        adcConfig[ADC_EXTERNAL1].sampleTime = ADC_SampleTime_601Cycles5;
+        adcConfig[ADC_EXTERNAL1].enabled = true;
+        adcChannelCount++;
+    }
 #endif
 
     RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div256);  // 72 MHz divided by 256 = 281.25 kHz