diff --git a/alxd/src/device/mod.rs b/alxd/src/device/mod.rs
index bf1f19a68f..ba6219e6e5 100644
--- a/alxd/src/device/mod.rs
+++ b/alxd/src/device/mod.rs
@@ -1702,7 +1702,7 @@ impl Alx {
 
         let mac = self.get_perm_macaddr();
         print!("{}", format!("   - MAC: {:>02X}:{:>02X}:{:>02X}:{:>02X}:{:>02X}:{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
-        let _ = setcfg("mac", &format!("{:>02X}.{:>02X}.{:>02X}.{:>02X}.{:>02X}.{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
+        let _ = setcfg("mac", &format!("{:>02X}-{:>02X}-{:>02X}-{:>02X}-{:>02X}-{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
 
         if ! self.get_phy_info() {
             println!("   - Identify PHY failed");
diff --git a/e1000d/src/device.rs b/e1000d/src/device.rs
index 077b8f4a80..194dd4eef7 100644
--- a/e1000d/src/device.rs
+++ b/e1000d/src/device.rs
@@ -306,7 +306,7 @@ impl Intel8254x {
                     mac_high as u8,
                     (mac_high >> 8) as u8];
         print!("{}", format!("   - MAC: {:>02X}:{:>02X}:{:>02X}:{:>02X}:{:>02X}:{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
-        let _ = setcfg("mac", &format!("{:>02X}.{:>02X}.{:>02X}.{:>02X}.{:>02X}.{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
+        let _ = setcfg("mac", &format!("{:>02X}-{:>02X}-{:>02X}-{:>02X}-{:>02X}-{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
 
         //
         // MTA => 0;
diff --git a/rtl8168d/src/device.rs b/rtl8168d/src/device.rs
index 6873f37291..a3c8ac476f 100644
--- a/rtl8168d/src/device.rs
+++ b/rtl8168d/src/device.rs
@@ -220,7 +220,7 @@ impl Rtl8168 {
                     mac_high as u8,
                     (mac_high >> 8) as u8];
         print!("{}", format!("   - MAC: {:>02X}:{:>02X}:{:>02X}:{:>02X}:{:>02X}:{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
-        let _ = setcfg("mac", &format!("{:>02X}.{:>02X}.{:>02X}.{:>02X}.{:>02X}.{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
+        let _ = setcfg("mac", &format!("{:>02X}-{:>02X}-{:>02X}-{:>02X}-{:>02X}-{:>02X}\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]));
 
         // Reset - this will disable tx and rx, reinitialize FIFOs, and set the system buffer pointer to the initial value
         self.regs.cmd.writef(1 << 4, true);