diff --git a/pkg/scalers/prometheus_scaler.go b/pkg/scalers/prometheus_scaler.go
index b46cf271501..027d355e020 100644
--- a/pkg/scalers/prometheus_scaler.go
+++ b/pkg/scalers/prometheus_scaler.go
@@ -32,7 +32,6 @@ const (
 	promThreshold           = "threshold"
 	promActivationThreshold = "activationThreshold"
 	promNamespace           = "namespace"
-	promCortexScopeOrgID    = "cortexOrgID"
 	promCustomHeaders       = "customHeaders"
 	ignoreNullValues        = "ignoreNullValues"
 	unsafeSsl               = "unsafeSsl"
@@ -204,10 +203,6 @@ func parsePrometheusMetadata(config *scalersconfig.ScalerConfig) (meta *promethe
 		meta.namespace = val
 	}
 
-	if val, ok := config.TriggerMetadata[promCortexScopeOrgID]; ok && val != "" {
-		return nil, fmt.Errorf("cortexOrgID is deprecated, please use customHeaders instead")
-	}
-
 	if val, ok := config.TriggerMetadata[promCustomHeaders]; ok && val != "" {
 		customHeaders, err := kedautil.ParseStringList(val)
 		if err != nil {
diff --git a/pkg/scalers/prometheus_scaler_test.go b/pkg/scalers/prometheus_scaler_test.go
index 844920f6d12..ffaa8c1fe6b 100644
--- a/pkg/scalers/prometheus_scaler_test.go
+++ b/pkg/scalers/prometheus_scaler_test.go
@@ -60,8 +60,6 @@ var testPromMetadata = []parsePrometheusMetadataTestData{
 	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "customHeaders": "key1=value1,key2=value2"}, false},
 	// customHeaders with wrong format
 	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "customHeaders": "key1=value1,key2"}, true},
-	// deprecated cortexOrgID
-	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "cortexOrgID": "my-org"}, true},
 	// queryParameters
 	{map[string]string{"serverAddress": "http://localhost:9090", "metricName": "http_requests_total", "threshold": "100", "query": "up", "queryParameters": "key1=value1,key2=value2"}, false},
 	// queryParameters with wrong format