diff --git a/firmware/common/ctype.c b/firmware/common/ctype.c
index 26512e2db8..5ec0af8add 100644
--- a/firmware/common/ctype.c
+++ b/firmware/common/ctype.c
@@ -1,7 +1,8 @@
 #include <ctype.h>
 
 char    _ctype_[257]={
-	_C,	_C,	_C,	_C,	_C,	_C,	_C,	_C,
+	0,
+    _C,	_C,	_C,	_C,	_C,	_C,	_C,	_C,
 	_C,	_C|_S,	_C|_S,	_C|_S,	_C|_S,	_C|_S,	_C,	_C,
 	_C,	_C,	_C,	_C,	_C,	_C,	_C,	_C,
 	_C,	_C,	_C,	_C,	_C,	_C,	_C,	_C,