diff --git a/Functions/DCIM/RearPorts/Add-NetboxDCIMRearPort.ps1 b/Functions/DCIM/RearPorts/Add-NetboxDCIMRearPort.ps1
index 2fce318..689632d 100644
--- a/Functions/DCIM/RearPorts/Add-NetboxDCIMRearPort.ps1
+++ b/Functions/DCIM/RearPorts/Add-NetboxDCIMRearPort.ps1
@@ -18,6 +18,7 @@ function Add-NetboxDCIMRearPort
         [Parameter(Mandatory = $true)]
         [string]$Type,
 
+        [ValidatePattern('^[0-9a-f]{6}$')]
         [string]$Color,
 
         [uint16]$Positions = 1,
diff --git a/Functions/DCIM/RearPorts/Set-NetboxDCIMRearPort.ps1 b/Functions/DCIM/RearPorts/Set-NetboxDCIMRearPort.ps1
index 7251e4d..044eb5c 100644
--- a/Functions/DCIM/RearPorts/Set-NetboxDCIMRearPort.ps1
+++ b/Functions/DCIM/RearPorts/Set-NetboxDCIMRearPort.ps1
@@ -20,6 +20,7 @@ function Set-NetboxDCIMRearPort
 
         [string]$Type,
 
+        [ValidatePattern('^[0-9a-f]{6}$')]
         [string]$Color,
 
         [uint16]$Positions,