diff --git a/at.c b/at.c
index 104921a..634795e 100644
--- a/at.c
+++ b/at.c
@@ -404,8 +404,9 @@ 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++;
 	}