diff --git a/modules/nextflow/src/main/groovy/nextflow/cli/CmdPull.groovy b/modules/nextflow/src/main/groovy/nextflow/cli/CmdPull.groovy
index bab137fe81..9411a64aed 100644
--- a/modules/nextflow/src/main/groovy/nextflow/cli/CmdPull.groovy
+++ b/modules/nextflow/src/main/groovy/nextflow/cli/CmdPull.groovy
@@ -78,6 +78,9 @@ class CmdPull {
         this.options = options
     }
 
+    /* only for testing purpose */
+    CmdPull() {}
+
     void run() {
 
         if( !all && !pipeline )