diff --git a/src/pcd.rs b/src/pcd.rs
index 92e60f0..7b918e2 100644
--- a/src/pcd.rs
+++ b/src/pcd.rs
@@ -134,4 +134,10 @@ fn key(address: &MacAddress, checksum: u16) -> [u8; 8] {
         hw_high = key[i_high];
     }
     key
+}
+
+pub fn zero_pad(header: PCDHeader) -> PCDFragment {
+    let mut padded_header: PCDFragment = [0; PCD_FRAGMENT_LENGTH];
+    padded_header.copy_from_slice(&header);
+    padded_header
 }
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