--- a/set_limit.c
+++ b/set_limit.c
@@ -3,9 +3,11 @@
  * Copyright (C) 2008 Markus Broeker
  */
 
-#include <sys/time.h>
+#include <errno.h>
 #include <sys/resource.h>
 
+#define MINIMUM (2*1024*1024)
+
 int set_limit (int megs)
 {
     struct rlimit rlim;
@@ -14,8 +16,10 @@
 
     rlim.rlim_cur = megs;
     rlim.rlim_max = 1.25 * megs;
-    if (megs > (4 * 1024 * 1024))
+    if (megs >= MINIMUM)
         return setrlimit (RLIMIT_AS, &rlim);
 
+    errno = ENOMEM;
+
     return -1;
 }