diff --git a/drivers/include/saul.h b/drivers/include/saul.h
index 99b9a03b8c..490d0f361c 100644
--- a/drivers/include/saul.h
+++ b/drivers/include/saul.h
@@ -134,6 +134,7 @@ enum {
     SAUL_SENSE_ID_VOLTAGE,          /**< sensor: voltage */
     SAUL_SENSE_ID_PH,               /**< sensor: pH */
     SAUL_SENSE_ID_POWER,            /**< sensor: power */
+    SAUL_SENSE_ID_SIZE,             /**< sensor: size */
     SAUL_SENSE_NUMOF                /**< Number of actuators supported */
     /* Extend this list as needed, but keep SAUL_SENSE_ID_ANY the first and
      * SAUL_SENSE_NUMOF the last entry
@@ -180,6 +181,7 @@ enum {
     SAUL_SENSE_VOLTAGE      = SAUL_CAT_SENSE | SAUL_SENSE_ID_VOLTAGE,       /**< sensor: voltage */
     SAUL_SENSE_PH           = SAUL_CAT_SENSE | SAUL_SENSE_ID_PH,            /**< sensor: pH */
     SAUL_SENSE_POWER        = SAUL_CAT_SENSE | SAUL_SENSE_ID_POWER,         /**< sensor: power */
+    SAUL_SENSE_SIZE         = SAUL_CAT_SENSE | SAUL_SENSE_ID_SIZE,          /**< sensor: size */
     SAUL_CLASS_ANY          = 0xff                                      /**< any device - wildcard */
     /* extend this list as needed... */
 };
diff --git a/drivers/saul/saul_str.c b/drivers/saul/saul_str.c
index 0cc89ac5d4..0082e39fc6 100644
--- a/drivers/saul/saul_str.c
+++ b/drivers/saul/saul_str.c
@@ -62,6 +62,7 @@ static const char *sensors[] = {
     [SAUL_SENSE_ID_VOLTAGE]     = "SENSE_VOLTAGE",
     [SAUL_SENSE_ID_PH]          = "SENSE_PH",
     [SAUL_SENSE_ID_POWER]       = "SENSE_POWER",
+    [SAUL_SENSE_ID_SIZE]        = "SENSE_SIZE",
 };
 
 const char *saul_class_to_str(const uint8_t class_id)