diff --git a/rechnung.sh b/rechnung.sh
index 27d1b03..08f0f76 100755
--- a/rechnung.sh
+++ b/rechnung.sh
@@ -119,7 +119,7 @@ print_failed() {
         else
             printf " Failed\n"
         fi
-        if [ ! -z "$msg" ]; then
+        if [ -n "$msg" ]; then
             print_error "$msg"
         fi
     fi