1 files changed, 7 insertions, 0 deletions

diff --git a/src/util/getopt_helpers.c b/src/util/getopt_helpers.c
index c55b22fb6..32cce65dd 100644
--- a/src/util/getopt_helpers.c
+++ b/src/util/getopt_helpers.c
@@ -748,6 +748,13 @@ set_uint (struct GNUNET_GETOPT_CommandLineProcessorContext *ctx,
   unsigned int *val = scls;
 
   (void) ctx;
+  if('-' == *value)
+  {
+        FPRINTF (stderr,
+                _("Your input for the '%s' option has to be a non negative number \n"),
+                option);
+        return GNUNET_SYSERR;
+  }
   if (1 != SSCANF (value,
                    "%u",
                    val))