diff -up at-3.1.14/at.c.export at-3.1.14/at.c
--- at-3.1.14/at.c.export	2013-10-07 14:53:59.980521240 +0200
+++ at-3.1.14/at.c	2013-10-07 14:54:35.722560527 +0200
@@ -388,8 +388,9 @@ writefile(time_t runtimer, char queue)
 	    unsigned int i;
 	    for (i = 0; i < sizeof(no_export) / sizeof(no_export[0]); i++) {
 		export = export
-		    && (strncmp(*atenv, no_export[i],
-				(size_t) (eqp - *atenv)) != 0);
+			&& ((((size_t) (eqp - *atenv)) != strlen(no_export[i]))
+			||(strncmp(*atenv, no_export[i],(size_t) (eqp - *atenv)) != 0)
+			);
 	    }
 	    eqp++;
 	}