diff --git a/workflow/qhtcp-workflow b/workflow/qhtcp-workflow
index 2e4a7f5b..36d72cb7 100755
--- a/workflow/qhtcp-workflow
+++ b/workflow/qhtcp-workflow
@@ -467,8 +467,8 @@ install_dependencies() {
 
   # Install perl CPAN modules
   echo "Installing perl CPAN modules"
-  debug "cpan" "${depends_perl[@]}"
-  cpan "${depends_perl[@]}"
+  debug "cpan -I ${depends_perl[*]}"
+  cpan -I "${depends_perl[@]}"
 
   # Install R packages
   echo "Installing R packages"