diff --git a/SegmentDisplay.cpp b/SegmentDisplay.cpp
index 14c0e23..2de1ae1 100644
--- a/SegmentDisplay.cpp
+++ b/SegmentDisplay.cpp
@@ -99,7 +99,7 @@ void SegmentDisplay::writeRaw(char const* value)
   byte digitMask = 1 << (digits - 1);
   byte charIndex = 0;
 
-  while (charIndex < digits && value[charIndex] != '\0')
+  while (charIndex < digits)
   {
     writeDisplay(value[charIndex], digitMask);
 
diff --git a/SegmentDisplayChars.h b/SegmentDisplayChars.h
index 407a63d..e907a80 100644
--- a/SegmentDisplayChars.h
+++ b/SegmentDisplayChars.h
@@ -216,12 +216,12 @@
 #define CharN SegmentC | SegmentE | SegmentG
 
 /**
+ *
  *  _
- * | |
  * |_|
  *
 **/
-#define CharO SegmentA | SegmentB | SegmentC | SegmentD | SegmentE | SegmentF
+#define CharO SegmentC | SegmentD | SegmentE | SegmentG
 
 /**
  *  _