diff --git a/rechnung.sh b/rechnung.sh
index 1b7399c..ceae052 100755
--- a/rechnung.sh
+++ b/rechnung.sh
@@ -126,7 +126,7 @@ print_failed() {
             printf " Failed\n"
         fi
     fi
-    if [ ! -z "$@" ]; then
+    if [ -n "$@" ]; then
         print_error "$@"
     fi
 }