diff --git a/contrib/freemobile-munin b/contrib/freemobile-munin
index 550a8b07..8568acd5 100755
--- a/contrib/freemobile-munin
+++ b/contrib/freemobile-munin
@@ -158,6 +158,7 @@ else {
 			doubleprint("0 \n");
 		}
 	}
+	close(CACHE);
 }
 
 sub doubleprint {