diff --git a/modules/gunzip/main.nf b/modules/gunzip/main.nf
index 61bf1afa..70367049 100644
--- a/modules/gunzip/main.nf
+++ b/modules/gunzip/main.nf
@@ -31,4 +31,14 @@ process GUNZIP {
         gunzip: \$(echo \$(gunzip --version 2>&1) | sed 's/^.*(gzip) //; s/ Copyright.*\$//')
     END_VERSIONS
     """
+
+    stub:
+    gunzip = archive.toString() - '.gz'
+    """
+    touch $gunzip
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        gunzip: \$(echo \$(gunzip --version 2>&1) | sed 's/^.*(gzip) //; s/ Copyright.*\$//')
+    END_VERSIONS
+    """
 }