diff --git a/modules/nf-core/pints/caller/main.nf b/modules/nf-core/pints/caller/main.nf
index 27cf5c57..e4ad10b7 100644
--- a/modules/nf-core/pints/caller/main.nf
+++ b/modules/nf-core/pints/caller/main.nf
@@ -9,7 +9,7 @@ process PINTS_CALLER {
         'community.wave.seqera.io/library/pybedtools_bedtools_htslib_pip_pypints:39699b96998ec5f6' }"
 
     input:
-    tuple val(meta), path(bams), path(bais), val(chr_name)
+    tuple val(meta), path(bams, arity: '1..*'), path(bais), val(chr_name)
     val assay_type
 
     output:
diff --git a/modules/nf-core/pints/caller/pints-caller.diff b/modules/nf-core/pints/caller/pints-caller.diff
index ca6fcfd0..593458a6 100644
--- a/modules/nf-core/pints/caller/pints-caller.diff
+++ b/modules/nf-core/pints/caller/pints-caller.diff
@@ -18,7 +18,7 @@ Changes in 'pints/caller/main.nf':
  
      input:
 -    tuple val(meta), path(bams), path(bais)
-+    tuple val(meta), path(bams), path(bais), val(chr_name) 
++    tuple val(meta), path(bams, arity: '1..*'), path(bais), val(chr_name)
      val assay_type
  
      output: