Index: head/sys/vm/vm_mmap.c
===================================================================
--- head/sys/vm/vm_mmap.c
+++ head/sys/vm/vm_mmap.c
@@ -259,7 +259,7 @@
 	size = len + pageoff;			/* low end... */
 	size = round_page(size);		/* hi end */
 	/* Check for rounding up to zero. */
-	if (len < size)
+	if (len > size)
 		return (ENOMEM);
 
 	/* Ensure alignment is at least a page and fits in a pointer. */