diff --git a/src/bitvis.cpp b/src/bitvis.cpp
index 423d60d..bf4c88a 100644
--- a/src/bitvis.cpp
+++ b/src/bitvis.cpp
@@ -410,7 +410,7 @@ void CBitVis::InitChars()
   {\
     const unsigned int* pixarr = pixels;\
     std::vector<unsigned int> pixelvec;\
-    int charheight = CharHeight(pixarr);\
+    int charheight = CharHeight(pixarr, sizeof(pixels));\
     if (m_fontheight < charheight)\
       m_fontheight = charheight;\
     for (size_t i = 0; i < sizeof(pixels) / sizeof(pixels[0]); i++)\
@@ -517,10 +517,10 @@ void CBitVis::InitChars()
   GLYPH(' ',  ((const unsigned int[]){0x0, 0x0, 0x0}))
 }
 
-int CBitVis::CharHeight(const unsigned int* in)
+int CBitVis::CharHeight(const unsigned int* in, size_t size)
 {
   int highest = 0;
-  for (int i = 0; i < 8; i++)
+  for (size_t i = 0; i < size; i++)
   {
     for (int j = 0; j < 32; j++)
     {
diff --git a/src/bitvis.h b/src/bitvis.h
index 5e2b400..4b134c2 100644
--- a/src/bitvis.h
+++ b/src/bitvis.h
@@ -73,7 +73,7 @@ class CBitVis
     void ProcessAudio();
     void SendData(int64_t time);
     void SetText(uint8_t* buff, const char* str, int offset = 0);
-    int CharHeight(const unsigned int* in);
+    int CharHeight(const unsigned int* in, size_t size);
     void InitChars();
     static void JackError(const char* jackerror);
     static void JackInfo(const char* jackinfo);