diff --git a/README.md b/README.md
index e12300f..2d3c054 100644
--- a/README.md
+++ b/README.md
@@ -149,6 +149,12 @@ tenant:
   # https://grafana.com/docs/mimir/latest/configure/about-tenant-ids/
   # env: CT_TENANT_PREFIX
   prefix: foobar-
+
+  # If true will use the tenant ID of the inbound request as the prefix of the new tenant id.
+  # Will be automatically suffixed with a `-` character.
+  # https://grafana.com/docs/mimir/latest/configure/about-tenant-ids/
+  # env: CT_TENANT_PREFIX
+  prefix_prefer_source: false
 ```
 
 ### Prometheus configuration example
diff --git a/VERSION b/VERSION
index 81f3632..89c881b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.12.3
+1.12.4
diff --git a/config.go b/config.go
index 9b02490..d03cd00 100644
--- a/config.go
+++ b/config.go
@@ -37,12 +37,13 @@ type config struct {
 	}
 
 	Tenant struct {
-		Label       string `env:"CT_TENANT_LABEL"`
-		Prefix      string `yaml:"prefix" env:"CT_TENANT_PREFIX"`
-		LabelRemove bool   `yaml:"label_remove" env:"CT_TENANT_LABEL_REMOVE"`
-		Header      string `env:"CT_TENANT_HEADER"`
-		Default     string `env:"CT_TENANT_DEFAULT"`
-		AcceptAll   bool   `yaml:"accept_all" env:"CT_TENANT_ACCEPT_ALL"`
+		Label              string `env:"CT_TENANT_LABEL"`
+		Prefix             string `yaml:"prefix" env:"CT_TENANT_PREFIX"`
+		PrefixPreferSource bool   `yaml:"prefix_prefer_source" env:"CT_TENANT_PREFIX_PREFER_SOURCE`
+		LabelRemove        bool   `yaml:"label_remove" env:"CT_TENANT_LABEL_REMOVE"`
+		Header             string `env:"CT_TENANT_HEADER"`
+		Default            string `env:"CT_TENANT_DEFAULT"`
+		AcceptAll          bool   `yaml:"accept_all" env:"CT_TENANT_ACCEPT_ALL"`
 	}
 
 	pipeIn  *fhu.InmemoryListener
diff --git a/config.yml b/config.yml
index c74e0f7..c7fc1e0 100644
--- a/config.yml
+++ b/config.yml
@@ -22,6 +22,7 @@ log_response_errors: true
 tenant:
   label: tenant
   prefix: ""
+  prefix_prefer_source: false
   label_remove: true
   header: X-Scope-OrgID
   default: ""
diff --git a/deploy/k8s/chart/Chart.yaml b/deploy/k8s/chart/Chart.yaml
index 38ac7e4..14f0927 100644
--- a/deploy/k8s/chart/Chart.yaml
+++ b/deploy/k8s/chart/Chart.yaml
@@ -1,8 +1,8 @@
 apiVersion: v2
 description: A Helm Chart for cortex-tenant
 name: cortex-tenant
-version: 0.4.0 # This is the chart version
-appVersion: 1.11.0 # version number of the application being deployed.
+version: 0.4.1 # This is the chart version
+appVersion: 1.12.4 # version number of the application being deployed.
 type: application
 sources:
   - https://github.com/blind-oracle/cortex-tenant
diff --git a/deploy/k8s/chart/templates/configmap.yaml b/deploy/k8s/chart/templates/configmap.yaml
index 4d518cd..7bed384 100644
--- a/deploy/k8s/chart/templates/configmap.yaml
+++ b/deploy/k8s/chart/templates/configmap.yaml
@@ -26,6 +26,7 @@ data:
     tenant:
       label: {{ .Values.config.tenant.label }}
       prefix: {{ .Values.config.tenant.prefix }}
+      prefix_prefer_source: {{ .Values.config.tenant.prefix_prefer_source }}
       label_remove: {{ .Values.config.tenant.label_remove }}
       header: {{ .Values.config.tenant.header }}
       default: {{ .Values.config.tenant.default }}
diff --git a/deploy/k8s/chart/values.schema.json b/deploy/k8s/chart/values.schema.json
index 9b1458d..c28d7c7 100644
--- a/deploy/k8s/chart/values.schema.json
+++ b/deploy/k8s/chart/values.schema.json
@@ -265,6 +265,12 @@
               "title": "Prefix",
               "description": "Optional hard-coded prefix with delimeter for all tenant values"
             },
+            "prefix_prefer_source": {
+              "type": "boolean",
+              "title": "Prefix Prefer Source",
+              "description": "If true will use the tenant ID of the inbound request as the prefix of the new tenant id.",
+              "default": false
+            },
             "label_remove": {
               "type": "boolean",
               "title": "Label Remove",
diff --git a/deploy/k8s/chart/values.yaml b/deploy/k8s/chart/values.yaml
index 3a9326a..e0c2343 100644
--- a/deploy/k8s/chart/values.yaml
+++ b/deploy/k8s/chart/values.yaml
@@ -105,6 +105,10 @@ config:
     # https://grafana.com/docs/mimir/latest/configure/about-tenant-ids/
     # (env: `CT_TENANT_PREFIX`)
     prefix: ""
+    # -- If true will use the tenant ID of the inbound request as the prefix of the new tenant id.
+    # Will be automatically suffixed with a `-` character.
+    # (env: `CT_TENANT_PREFIX_PREFER_SOURCE`)
+    prefix_prefer_source: false
     # -- Whether to remove the tenant label from the request
     # (env: `CT_TENANT_LABEL_REMOVE`)
     label_remove: false
diff --git a/deploy/k8s/manifests/config-file-configmap.yml b/deploy/k8s/manifests/config-file-configmap.yml
index 6c8eaf8..4ffa9b7 100644
--- a/deploy/k8s/manifests/config-file-configmap.yml
+++ b/deploy/k8s/manifests/config-file-configmap.yml
@@ -42,6 +42,10 @@ data:
       # Delimeters allowed for use:
       # https://grafana.com/docs/mimir/latest/configure/about-tenant-ids/
       prefix: ""
+      # If true will use the tenant ID of the inbound request as the prefix of the new tenant id.
+      # Will be automatically suffixed with a `-` character.
+      # https://grafana.com/docs/mimir/latest/configure/about-tenant-ids/
+      prefix_prefer_source: false
       # Whether to remove the tenant label from the request
       label_remove: false
       # To which header to add the tenant ID
diff --git a/processor.go b/processor.go
index 591b516..aaf1cfd 100644
--- a/processor.go
+++ b/processor.go
@@ -169,6 +169,14 @@ func (p *processor) handle(ctx *fh.RequestCtx) {
 		return
 	}
 
+	tenantPrefix := p.cfg.Tenant.Prefix
+
+	if p.cfg.Tenant.PrefixPreferSource {
+		if string(ctx.Request.Header.Peek("X-Scope-OrgID")) != "" {
+			tenantPrefix = string(ctx.Request.Header.Peek("X-Scope-OrgID")) + "-"
+		}
+	}
+
 	clientIP := ctx.RemoteAddr()
 	reqID, _ := uuid.NewRandom()
 
@@ -176,7 +184,7 @@ func (p *processor) handle(ctx *fh.RequestCtx) {
 		// If there's metadata - just accept the request and drop it
 		if len(wrReqIn.Metadata) > 0 {
 			if p.cfg.Metadata && p.cfg.Tenant.Default != "" {
-				r := p.send(clientIP, reqID, p.cfg.Tenant.Default, wrReqIn)
+				r := p.send(clientIP, reqID, tenantPrefix, p.cfg.Tenant.Default, wrReqIn)
 				if r.err != nil {
 					ctx.Error(err.Error(), fh.StatusInternalServerError)
 					p.Errorf("src=%s req_id=%s: unable to proxy metadata: %s", clientIP, reqID, r.err)
@@ -201,7 +209,7 @@ func (p *processor) handle(ctx *fh.RequestCtx) {
 
 	metricTenant := ""
 	var errs *me.Error
-	results := p.dispatch(clientIP, reqID, m)
+	results := p.dispatch(clientIP, reqID, tenantPrefix, m)
 
 	code, body := 0, []byte("Ok")
 
@@ -303,7 +311,7 @@ func (p *processor) marshal(wr *prompb.WriteRequest) (bufOut []byte, err error)
 	return snappy.Encode(nil, b), nil
 }
 
-func (p *processor) dispatch(clientIP net.Addr, reqID uuid.UUID, m map[string]*prompb.WriteRequest) (res []result) {
+func (p *processor) dispatch(clientIP net.Addr, reqID uuid.UUID, tenantPrefix string, m map[string]*prompb.WriteRequest) (res []result) {
 	var wg sync.WaitGroup
 	res = make([]result, len(m))
 
@@ -314,7 +322,7 @@ func (p *processor) dispatch(clientIP net.Addr, reqID uuid.UUID, m map[string]*p
 		go func(idx int, tenant string, wrReq *prompb.WriteRequest) {
 			defer wg.Done()
 
-			r := p.send(clientIP, reqID, tenant, wrReq)
+			r := p.send(clientIP, reqID, tenantPrefix, tenant, wrReq)
 			res[idx] = r
 		}(i, tenant, wrReq)
 
@@ -356,7 +364,7 @@ func (p *processor) processTimeseries(ts *prompb.TimeSeries) (tenant string, err
 	return
 }
 
-func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenant string, wr *prompb.WriteRequest) (r result) {
+func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenantPrefix string, tenant string, wr *prompb.WriteRequest) (r result) {
 	start := time.Now()
 	r.tenant = tenant
 
@@ -374,7 +382,7 @@ func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenant string, wr *
 		return
 	}
 
-	p.fillRequestHeaders(clientIP, reqID, tenant, req)
+	p.fillRequestHeaders(clientIP, reqID, tenantPrefix, tenant, req)
 
 	if p.auth.egressHeader != nil {
 		req.Header.SetBytesV("Authorization", p.auth.egressHeader)
@@ -398,14 +406,14 @@ func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenant string, wr *
 }
 
 func (p *processor) fillRequestHeaders(
-	clientIP net.Addr, reqID uuid.UUID, tenant string, req *fh.Request) {
+	clientIP net.Addr, reqID uuid.UUID, tenantPrefix string, tenant string, req *fh.Request) {
 	req.Header.Set("Content-Encoding", "snappy")
 	req.Header.Set("Content-Type", "application/x-protobuf")
 	req.Header.Set("X-Prometheus-Remote-Write-Version", "0.1.0")
 	req.Header.Set("X-Cortex-Tenant-Client", clientIP.String())
 	req.Header.Set("X-Cortex-Tenant-ReqID", reqID.String())
-	if p.cfg.Tenant.Prefix != "" {
-		tenant = p.cfg.Tenant.Prefix + tenant
+	if tenantPrefix != "" {
+		tenant = tenantPrefix + tenant
 	}
 	req.Header.Set(p.cfg.Tenant.Header, tenant)
 }
diff --git a/processor_test.go b/processor_test.go
index 7da5418..f97dc4c 100644
--- a/processor_test.go
+++ b/processor_test.go
@@ -219,7 +219,7 @@ func Test_request_headers(t *testing.T) {
 	req := fh.AcquireRequest()
 	clientIP, _ := net.ResolveIPAddr("ip", "1.1.1.1")
 	reqID, _ := uuid.NewRandom()
-	p.fillRequestHeaders(clientIP, reqID, "my-tenant", req)
+	p.fillRequestHeaders(clientIP, reqID, "", "my-tenant", req)
 
 	assert.Equal(t, "snappy", string(req.Header.Peek("Content-Encoding")))
 	assert.Equal(t, "my-tenant", string(req.Header.Peek("X-Scope-OrgID")))
@@ -234,7 +234,7 @@ func Test_request_headers_with_prefix(t *testing.T) {
 	req := fh.AcquireRequest()
 	clientIP, _ := net.ResolveIPAddr("ip", "1.1.1.1")
 	reqID, _ := uuid.NewRandom()
-	p.fillRequestHeaders(clientIP, reqID, "my-tenant", req)
+	p.fillRequestHeaders(clientIP, reqID, "foobar-", "my-tenant", req)
 
 	assert.Equal(t, "foobar-my-tenant", string(req.Header.Peek("X-Scope-OrgID")))
 }