diff --git a/sudo.c b/sudo.c
index 91d779380..8d2b642a4 100644
--- a/sudo.c
+++ b/sudo.c
@@ -259,6 +259,7 @@ char ** tenvp;
 
 for ( envlen=0; envp[envlen]; envlen++ )
     ; /* noop */
+++envlen;
 
 Envp = (char **) malloc ( sizeof (char **) * envlen );