diff --git a/windows/hid.c b/windows/hid.c
index a8cff54..9785433 100755
--- a/windows/hid.c
+++ b/windows/hid.c
@@ -794,7 +794,7 @@ int HID_API_EXPORT_CALL HID_API_CALL hid_get_manufacturer_string(hid_device *dev
 {
 	BOOL res;
 
-	res = HidD_GetManufacturerString(dev->device_handle, string, 2 * maxlen);
+	res = HidD_GetManufacturerString(dev->device_handle, string, sizeof(wchar_t) * maxlen);
 	if (!res) {
 		register_error(dev, "HidD_GetManufacturerString");
 		return -1;
@@ -807,7 +807,7 @@ int HID_API_EXPORT_CALL HID_API_CALL hid_get_product_string(hid_device *dev, wch
 {
 	BOOL res;
 
-	res = HidD_GetProductString(dev->device_handle, string, 2 * maxlen);
+	res = HidD_GetProductString(dev->device_handle, string, sizeof(wchar_t) * maxlen);
 	if (!res) {
 		register_error(dev, "HidD_GetProductString");
 		return -1;
@@ -820,7 +820,7 @@ int HID_API_EXPORT_CALL HID_API_CALL hid_get_serial_number_string(hid_device *de
 {
 	BOOL res;
 
-	res = HidD_GetSerialNumberString(dev->device_handle, string, 2 * maxlen);
+	res = HidD_GetSerialNumberString(dev->device_handle, string, sizeof(wchar_t) * maxlen);
 	if (!res) {
 		register_error(dev, "HidD_GetSerialNumberString");
 		return -1;
@@ -833,7 +833,7 @@ int HID_API_EXPORT_CALL HID_API_CALL hid_get_indexed_string(hid_device *dev, int
 {
 	BOOL res;
 
-	res = HidD_GetIndexedString(dev->device_handle, string_index, string, 2 * maxlen);
+	res = HidD_GetIndexedString(dev->device_handle, string_index, string, sizeof(wchar_t) * maxlen);
 	if (!res) {
 		register_error(dev, "HidD_GetIndexedString");
 		return -1;