diff --git a/sampling.c b/sampling.c
index 2070218..22ce178 100644
--- a/sampling.c
+++ b/sampling.c
@@ -22,7 +22,8 @@ volatile uint32_t gADCErrors = 0; // number of missed ADC deadlines
 void ADC_ISR(void)
 {
     // clear ADC1 sequence0 interrupt flag in the ADCISC register
-    HWREGBITW(ADC1_ISC_R, 16) = 1;
+    //HWREGBITW(ADC1_ISC_R, 1) = 1;
+    ADC1_ISC_R |= 1;
 
     // check for ADC FIFO overflow
     if(ADC1_OSTAT_R & ADC_OSTAT_OV0) {