diff --git a/src/go/rpk/pkg/cli/container/start.go b/src/go/rpk/pkg/cli/container/start.go
index 37f09c1908e49..8aa6c164acdff 100644
--- a/src/go/rpk/pkg/cli/container/start.go
+++ b/src/go/rpk/pkg/cli/container/start.go
@@ -322,9 +322,9 @@ func startCluster(
 		seedID,
 		nodeAddr(seedKafkaPort),
 	}
-	kafkaAddr := []string{fmt.Sprintf("%v:%d", seedState.ContainerIP, seedKafkaPort)}
-	srAddr := []string{fmt.Sprintf("http://rp-node-%d:%d", seedID, seedSchemaRegPort)}
-	adminAddr := []string{fmt.Sprintf("http://rp-node-%d:%d", seedID, seedAdminPort)}
+	kafkaAddr := []string{fmt.Sprintf("%v:%d", seedState.ContainerIP, config.DefaultKafkaPort)}
+	srAddr := []string{fmt.Sprintf("http://rp-node-%d:%d", seedID, config.DefaultSchemaRegPort)}
+	adminAddr := []string{fmt.Sprintf("http://rp-node-%d:%d", seedID, config.DefaultAdminPort)}
 
 	nodes := []node{seedNode}
 
@@ -374,9 +374,9 @@ func startCluster(
 				id:   id,
 				addr: nodeAddr(state.HostKafkaPort),
 			})
-			kafkaAddr = append(kafkaAddr, fmt.Sprintf("%v:%d", state.ContainerIP, kafkaPort))
-			srAddr = append(srAddr, fmt.Sprintf("http://rp-node-%d:%d", id, schemaRegPort))
-			adminAddr = append(adminAddr, fmt.Sprintf("http://rp-node-%d:%d", id, adminPort))
+			kafkaAddr = append(kafkaAddr, fmt.Sprintf("%v:%d", state.ContainerIP, config.DefaultKafkaPort))
+			srAddr = append(srAddr, fmt.Sprintf("http://rp-node-%d:%d", id, config.DefaultSchemaRegPort))
+			adminAddr = append(adminAddr, fmt.Sprintf("http://rp-node-%d:%d", id, config.DefaultAdminPort))
 			mu.Unlock()
 			return nil
 		})