diff --git a/epan/dissectors/packet-usb-com.c b/epan/dissectors/packet-usb-com.c
index 8fc7805d75..2785469e29 100644
--- a/epan/dissectors/packet-usb-com.c
+++ b/epan/dissectors/packet-usb-com.c
@@ -479,7 +479,6 @@ dissect_usb_com_descriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
                     k_device_address = usb_conv_info->device_address;
                     k_frame_number = pinfo->num;
 
-                    offset = 3;
                     control_item = proto_tree_add_item_ret_uint(subtree, hf_usb_com_descriptor_control_interface, tvb, offset, 1, ENC_LITTLE_ENDIAN, &master);
 
                     if (master != usb_conv_info->interfaceNum) {
diff --git a/epan/dissectors/packet-usb-dfu.c b/epan/dissectors/packet-usb-dfu.c
index fb1b18b6d8..9497ae3900 100644
--- a/epan/dissectors/packet-usb-dfu.c
+++ b/epan/dissectors/packet-usb-dfu.c
@@ -338,13 +338,11 @@ dissect_usb_dfu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
     command_tree = proto_item_add_subtree(command_item, ett_command);
     proto_item_set_generated(command_item);
 
-    if (command_data) {
-        command_item = proto_tree_add_uint(main_tree, hf_setup_interface, tvb, offset, 0, command_data->interface);
-        proto_item_set_generated(command_item);
+    command_item = proto_tree_add_uint(main_tree, hf_setup_interface, tvb, offset, 0, command_data->interface);
+    proto_item_set_generated(command_item);
 
-        command_item = proto_tree_add_uint(main_tree, hf_command_in_frame, tvb, offset, 0, command_data->command_frame_number);
-        proto_item_set_generated(command_item);
-    }
+    command_item = proto_tree_add_uint(main_tree, hf_command_in_frame, tvb, offset, 0, command_data->command_frame_number);
+    proto_item_set_generated(command_item);
 
     switch (command_response) {
     case 0x02: /* Upload */