diff --git a/adapters/yieldmo/params_test.go b/adapters/yieldmo/params_test.go
index 98ef46de0ac..0a8fe2d10f1 100644
--- a/adapters/yieldmo/params_test.go
+++ b/adapters/yieldmo/params_test.go
@@ -40,7 +40,7 @@ func TestInvalidParams(t *testing.T) {
 }
 
 var validParams = []string{
-	`{"placementid": "123"}`,
+	`{"placementId": "123"}`,
 }
 
 var invalidParams = []string{
diff --git a/adapters/yieldmo/yieldmotest/exemplary/simple-banner.json b/adapters/yieldmo/yieldmotest/exemplary/simple-banner.json
index ed0b7977047..11739ca1d32 100644
--- a/adapters/yieldmo/yieldmotest/exemplary/simple-banner.json
+++ b/adapters/yieldmo/yieldmotest/exemplary/simple-banner.json
@@ -14,7 +14,7 @@
         },
         "ext": {
           "bidder": {
-            "placementid": "123"
+            "placementId": "123"
           }
         }
       }
diff --git a/openrtb_ext/imp_yieldmo.go b/openrtb_ext/imp_yieldmo.go
index 99c4d268609..2a2080daf46 100644
--- a/openrtb_ext/imp_yieldmo.go
+++ b/openrtb_ext/imp_yieldmo.go
@@ -2,5 +2,5 @@ package openrtb_ext
 
 // ExtImpYieldmo defines the contract for bidrequest.imp[i].ext.yieldmo
 type ExtImpYieldmo struct {
-	PlacementId string `json:"placementid"`
+	PlacementId string `json:"placementId"`
 }
diff --git a/static/bidder-params/yieldmo.json b/static/bidder-params/yieldmo.json
index 6099ad25a88..f95044030f6 100644
--- a/static/bidder-params/yieldmo.json
+++ b/static/bidder-params/yieldmo.json
@@ -6,10 +6,10 @@
   
     "type": "object",
     "properties": {
-      "placementid": {
+      "placementId": {
         "type": "string",
         "description": "Internal Yieldmo Placement ID"
       }
     },
-    "required": ["placementid"]
+    "required": ["placementId"]
   }