diff --git a/adapters/openx/openx.go b/adapters/openx/openx.go
index ca88b18bdb8..c2a42adf295 100644
--- a/adapters/openx/openx.go
+++ b/adapters/openx/openx.go
@@ -22,7 +22,8 @@ type openxImpExt struct {
 }
 
 type openxReqExt struct {
-	DelDomain    string `json:"delDomain"`
+	DelDomain    string `json:"delDomain,omitempty"`
+	Platform     string `json:"platform,omitempty"`
 	BidderConfig string `json:"bc"`
 }
 
@@ -125,6 +126,7 @@ func preprocess(imp *openrtb.Imp, reqExt *openxReqExt) error {
 	}
 
 	reqExt.DelDomain = openxExt.DelDomain
+	reqExt.Platform = openxExt.Platform
 
 	imp.TagID = openxExt.Unit
 	imp.BidFloor = openxExt.CustomFloor
diff --git a/adapters/openx/openxtest/exemplary/optional-params.json b/adapters/openx/openxtest/exemplary/optional-params.json
index 225559875a8..e8fcf394b8b 100644
--- a/adapters/openx/openxtest/exemplary/optional-params.json
+++ b/adapters/openx/openxtest/exemplary/optional-params.json
@@ -11,6 +11,7 @@
           "bidder": {
             "unit": "539439964",
             "delDomain": "se-demo-d.openx.net",
+            "platform": "PLATFORM",
             "customFloor": 0.1,
             "customParams": {"foo": "bar"}
           }
@@ -40,7 +41,8 @@
           ],
           "ext": {
             "bc": "hb_pbs_1.0.0",
-            "delDomain": "se-demo-d.openx.net"
+            "delDomain": "se-demo-d.openx.net",
+            "platform": "PLATFORM"
           }
         }
       },
diff --git a/openrtb_ext/imp_openx.go b/openrtb_ext/imp_openx.go
index e63595b0912..2625cb3802d 100644
--- a/openrtb_ext/imp_openx.go
+++ b/openrtb_ext/imp_openx.go
@@ -3,6 +3,7 @@ package openrtb_ext
 // ExtImpOpenx defines the contract for bidrequest.imp[i].ext.openx
 type ExtImpOpenx struct {
 	Unit         string                 `json:"unit"`
+	Platform     string                 `json:"platform"`
 	DelDomain    string                 `json:"delDomain"`
 	CustomFloor  float64                `json:"customFloor"`
 	CustomParams map[string]interface{} `json:"customParams"`
diff --git a/static/bidder-params/openx.json b/static/bidder-params/openx.json
index 93a672ed629..9766373614b 100644
--- a/static/bidder-params/openx.json
+++ b/static/bidder-params/openx.json
@@ -16,6 +16,12 @@
       "pattern": "\\.[a-zA-Z]{2,3}$",
       "format": "hostname"
     },
+    "platform": {
+      "type": "string",
+      "description": "The platform id for the customer.",
+      "pattern": "^[0-9a-zA-Z-]+$",
+      "format": "uuid"
+    },
     "customFloor": {
       "type": "number",
       "description": "The minimum CPM price in USD.",
@@ -26,6 +32,19 @@
       "description": "User-defined targeting key-value pairs."
     }
   },
-
-  "required": ["unit", "delDomain"]
+  "required": [
+    "unit"
+  ],
+  "anyOf": [
+    {
+      "required": [
+        "delDomain"
+      ]
+    },
+    {
+      "required": [
+        "platform"
+      ]
+    }
+  ]
 }