diff --git a/main.gallery.nf b/main.gallery.nf
index e0cb1bdd..e60acf3d 100644
--- a/main.gallery.nf
+++ b/main.gallery.nf
@@ -10,6 +10,7 @@ test_file_quilt = 'quilt+s3://nf-core-gallery#package=nf-core/hlatyping&path=REA
 myFileChannel = Channel.fromList([file(test_file_s3), file(test_file_quilt)])
 
 process CHECK_INPUT {
+    container 'ubuntu:20.04'
     input:
         path input
 
diff --git a/main.nf b/main.nf
index a636f5fd..44f18b63 100644
--- a/main.nf
+++ b/main.nf
@@ -10,7 +10,6 @@ packageFiles = Channel.fromPath(params.input)
 
 process transfer {
     publishDir params.outdir, mode: 'copy', overwrite: true
-
     container 'ubuntu:20.04'
 
     input:
diff --git a/main.path.nf b/main.path.nf
index 7d91f301..9e32ab56 100644
--- a/main.path.nf
+++ b/main.path.nf
@@ -10,6 +10,7 @@ test_file_quilt = 'quilt+s3://quilt-example#package=examples/hurdat2&path=README
 myFileChannel = Channel.fromList([file(test_file_local), file(test_file_s3), file(test_file_quilt)])
 
 process CHECK_INPUT {
+    container 'ubuntu:20.04'
     input:
         path input