diff --git a/README.md b/README.md
index 6c0d197..293a9c9 100644
--- a/README.md
+++ b/README.md
@@ -66,12 +66,6 @@ See [`nf-core/configs`](https://github.com/nf-core/configs/tree/master/conf) for
 Please also make sure to add an extra `params` section with `params.config_profile_description`, `params.config_profile_contact` and `params.config_profile_url` set to reasonable values.
 Users will get information on who wrote the configuration profile then when executing a nf-core pipeline and can report back if there are things missing for example.
 
-### Checking user hostnames
-
-If your cluster has a set of consistent hostnames, nf-core pipelines can check that users are using your profile.
-Add one or more hostname substrings to `params.hostnames` under a key that matches the profile name.
-If the user's hostname contains this string at the start of a run or when a run fails and their profile does not contain the profile name, a warning message will be printed.
-
 ### Testing
 
 If you want to add a new custom config file to `nf-core/configs` please test that your pipeline of choice runs as expected by using the [`-c`](https://www.nextflow.io/docs/latest/config.html) parameter.
diff --git a/nfcore_custom.config b/nfcore_custom.config
index eb5b509..2aba7fa 100644
--- a/nfcore_custom.config
+++ b/nfcore_custom.config
@@ -61,23 +61,8 @@ profiles {
   uzh          { includeConfig "${params.custom_config_base}/conf/uzh.config" }
 }
 
-// If user hostnames contain one of these substring and they are
-// not running the associated profile, it will trigger a warning message
-// Should be defined here for all profiles (not within profile config)
 params {
-  // This is a groovy map, not a nextflow parameter set
-  hostnames = [
-    binac: ['.binac.uni-tuebingen.de'],
-    cbe: ['.cbe.vbc.ac.at'],
-    cfc: ['.hpc.uni-tuebingen.de'],
-    crick: ['.thecrick.org'],
-    genotoul: ['.genologin1.toulouse.inra.fr', '.genologin2.toulouse.inra.fr'],
-    genouest: ['.genouest.org'],
-    icr_davros: ['.davros.compute.estate'],
-    imperial: ['.hpc.ic.ac.uk'],
-    imperial_mb: ['.hpc.ic.ac.uk'],
-    uppmax: ['.uppmax.uu.se'],
-    utd_ganymede: ['ganymede.utdallas.edu'],
-    utd_sysbio: ['sysbio.utdallas.edu']
-  ]
+  // Changed from a Groovy Map to a string for backwards compatibility
+  // See https://github.com/nf-core/tools/issues/1304
+  hostnames = ''
 }