diff --git a/src/drivers/stm32/adc/adc.cpp b/src/drivers/stm32/adc/adc.cpp
index 00e46d6b82..0b8a275e6a 100644
--- a/src/drivers/stm32/adc/adc.cpp
+++ b/src/drivers/stm32/adc/adc.cpp
@@ -341,7 +341,7 @@ test(void)
 		err(1, "can't open ADC device");
 
 	for (unsigned i = 0; i < 50; i++) {
-		adc_msg_s data[10];
+		adc_msg_s data[12];
 		ssize_t count = read(fd, data, sizeof(data));
 
 		if (count < 0)
diff --git a/src/modules/sensors/sensors.cpp b/src/modules/sensors/sensors.cpp
index 6560dec3d6..8da5bb2946 100644
--- a/src/modules/sensors/sensors.cpp
+++ b/src/modules/sensors/sensors.cpp
@@ -1169,8 +1169,8 @@ Sensors::adc_poll(struct sensor_combined_s &raw)
 	hrt_abstime t = hrt_absolute_time();
 	/* rate limit to 100 Hz */
 	if (t - _last_adc >= 10000) {
-		/* make space for a maximum of ten channels (to ensure reading all channels at once) */
-		struct adc_msg_s buf_adc[10];
+		/* make space for a maximum of twelve channels (to ensure reading all channels at once) */
+		struct adc_msg_s buf_adc[12];
 		/* read all channels available */
 		int ret = read(_fd_adc, &buf_adc, sizeof(buf_adc));
 
diff --git a/src/modules/uORB/topics/sensor_combined.h b/src/modules/uORB/topics/sensor_combined.h
index 918389f38b..1171054707 100644
--- a/src/modules/uORB/topics/sensor_combined.h
+++ b/src/modules/uORB/topics/sensor_combined.h
@@ -99,8 +99,8 @@ struct sensor_combined_s {
 	float baro_pres_mbar;			/**< Barometric pressure, already temp. comp.     */
 	float baro_alt_meter;			/**< Altitude, already temp. comp.                */
 	float baro_temp_celcius;		/**< Temperature in degrees celsius               */
-	float adc_voltage_v[9];			/**< ADC voltages of ADC Chan 10/11/12/13 or -1      */
-	unsigned adc_mapping[9];		/**< Channel indices of each of these values */
+	float adc_voltage_v[10];		/**< ADC voltages of ADC Chan 10/11/12/13 or -1      */
+	unsigned adc_mapping[10];		/**< Channel indices of each of these values */
 	float mcu_temp_celcius;			/**< Internal temperature measurement of MCU */
 	uint32_t baro_counter;			/**< Number of raw baro measurements taken        */
 
diff --git a/src/systemcmds/tests/test_adc.c b/src/systemcmds/tests/test_adc.c
index 7302f63cce..03391b8514 100644
--- a/src/systemcmds/tests/test_adc.c
+++ b/src/systemcmds/tests/test_adc.c
@@ -66,8 +66,8 @@ int test_adc(int argc, char *argv[])
 	}
 
 	for (unsigned i = 0; i < 5; i++) {
-		/* make space for a maximum of ten channels */
-		struct adc_msg_s data[10];
+		/* make space for a maximum of twelve channels */
+		struct adc_msg_s data[12];
 		/* read all channels available */
 		ssize_t count = read(fd, data, sizeof(data));