diff -Naur a/src/aalinuxkbd.c b/src/aalinuxkbd.c
--- a/src/aalinuxkbd.c	2016-12-19 12:40:26.660039735 +0100
+++ b/src/aalinuxkbd.c	2016-12-19 12:42:21.692045971 +0100
@@ -114,6 +114,7 @@
 static int vtswitch_allowed;
 
 static char key_down[128];
+static size_t key_down_size = 128;
 static int closed = 1;
 static int mypid;
 
@@ -165,10 +166,7 @@
 
 static void blank_key_down(void)
 {
-    int f;
-
-    for (f = 0; f < NR_KEYS; f++)
-	key_down[f] = 0;
+    memset(key_down, 0, key_down_size);
 }