diff --git a/str.c b/str.c

index 41b27db..82b8ae4 100644

--- a/str.c

+++ b/str.c

@@ -113,7 +113,7 @@ str_strdup_trimmed(const struct mystr* p_str)

   for (h = 0; h < (int)str_getlen(p_str) && vsf_sysutil_isspace(p_trimmed[h]); h++) ;

   for (t = str_getlen(p_str) - 1; t >= 0 && vsf_sysutil_isspace(p_trimmed[t]); t--) ;

   newlen = t - h + 1;

-  return newlen ? vsf_sysutil_strndup(p_trimmed+h, (unsigned int)newlen) : 0L;

+  return (newlen > 0) ? vsf_sysutil_strndup(p_trimmed+h, (unsigned int)newlen) : 0L;

 }

 void