1 files changed, 1 insertions, 1 deletions

diff --git a/plugins/check_nt.c b/plugins/check_nt.c
index 50bf9f03..605d4792 100644
--- a/plugins/check_nt.c
+++ b/plugins/check_nt.c
@@ -180,7 +180,7 @@ int main(int argc, char **argv){
 
                 if (value_list==NULL)
                         output_message = strdup (_("missing -l parameters"));
-                else if (strlen(value_list)==1)
+                else if (strlen(value_list)!=1)
                         output_message = strdup (_("wrong -l argument"));
                 else {
                         asprintf(&send_buffer,"%s&4&%s", req_password, value_list);