diff --git a/nfcore_custom.config b/nfcore_custom.config
index e26116b..70fccd4 100644
--- a/nfcore_custom.config
+++ b/nfcore_custom.config
@@ -8,7 +8,7 @@
  * name here.
  */
 
-config_base = "${params.custom_config_base}/conf"
+config_base = params.custom_config_base ?: "${params.custom_config_base}/conf" : "https://raw.githubusercontent.com/nf-core/configs/${params.custom_config_version}/conf"
 
 profiles {
   binac        { includeConfig "${config_base}/binac.config" }