diff --git a/src/freedombone-dhparam b/src/freedombone-dhparam
index ac05c68e..0e56018c 100755
--- a/src/freedombone-dhparam
+++ b/src/freedombone-dhparam
@@ -200,8 +200,9 @@ do
             RECALCULATE=${1}
             ;;
         -o|--output)
+            shift
             FAST='yes'
-            calc_dh stdout
+            calc_dh ${1}
             exit 0
             ;;
         --fast)