diff --git a/libfprint/drivers/aesx660.c b/libfprint/drivers/aesx660.c
index d030d0e..6f35720 100644
--- a/libfprint/drivers/aesx660.c
+++ b/libfprint/drivers/aesx660.c
@@ -355,7 +355,7 @@ static void capture_read_stripe_data_cb(struct libusb_transfer *transfer)
 		if (aesdev->buffer_size == aesdev->buffer_max) {
 			if (aesdev->buffer_max == AESX660_HEADER_SIZE) {
 				aesdev->buffer_max = aesdev->buffer[AESX660_RESPONSE_SIZE_LSB_OFFSET] +
-					(aesdev->buffer[AESX660_RESPONSE_SIZE_MSB_OFFSEt] << 8) + AESX660_HEADER_SIZE;
+					(aesdev->buffer[AESX660_RESPONSE_SIZE_MSB_OFFSET] << 8) + AESX660_HEADER_SIZE;
 				fp_dbg("Got frame, type %.2x size %.4x",
 					aesdev->buffer[AESX660_RESPONSE_TYPE_OFFSET],
 					aesdev->buffer_max);
diff --git a/libfprint/drivers/aesx660.h b/libfprint/drivers/aesx660.h
index b53ad51..e354538 100644
--- a/libfprint/drivers/aesx660.h
+++ b/libfprint/drivers/aesx660.h
@@ -23,7 +23,7 @@
 #define AESX660_HEADER_SIZE 3
 #define AESX660_RESPONSE_TYPE_OFFSET 0x00
 #define AESX660_RESPONSE_SIZE_LSB_OFFSET 0x01
-#define AESX660_RESPONSE_SIZE_MSB_OFFSEt 0x02
+#define AESX660_RESPONSE_SIZE_MSB_OFFSET 0x02
 
 #define AESX660_CALIBRATE_RESPONSE 0x06
 #define AESX660_FINGER_DET_RESPONSE 0x40