diff --git a/xtandard.c b/xtandard.c
index f707de5..d643f8a 100644
--- a/xtandard.c
+++ b/xtandard.c
@@ -421,7 +421,7 @@ int character_is_symbol (char character) {
 }
 
 int character_is_visible (char character) {
-	return ((int) ((character >= '!') && (character <= '~')));
+	return ((int) ((character >= ' ') && (character <= '~')));
 }
 
 int character_is_invisible (char character) {