diff --git a/src/usb_hid.rs b/src/usb_hid.rs
index d2e8278..2779113 100644
--- a/src/usb_hid.rs
+++ b/src/usb_hid.rs
@@ -128,6 +128,10 @@ fn write_raw(device: &HidDevice, data: &[u8]) -> Result<()> {
 fn prepend_byte_and_offset(data: &[u8], offset: usize) -> [u8; 65] {
     let mut result: [u8; 65] = [0u8; 65];
     result[1] = 0x0;
-    result[1..].copy_from_slice(&data[offset..offset + 64]);
+    if data.len() - offset < 64 {
+        result[1..].copy_from_slice(&data[offset..]);
+    } else {
+        result[1..].copy_from_slice(&data[offset..offset + 64]);
+    }
     result
 }