diff --git a/3rdparty/fonts/fnt.cxx b/3rdparty/fonts/fnt.cxx
index 05a0ec0..0b3f4a2 100644
--- a/3rdparty/fonts/fnt.cxx
+++ b/3rdparty/fonts/fnt.cxx
@@ -108,13 +108,13 @@ float fntTexFont::low_putch ( sgVec3 curpos, float pointsize,
 
 
 
-void fntTexFont::setGlyph ( char c, float wid,
+void fntTexFont::setGlyph ( int c, float wid,
         float tex_left, float tex_right,
         float tex_bot , float tex_top  ,
         float vtx_left, float vtx_right,
         float vtx_bot , float vtx_top  )
 {
-  unsigned int cc = (unsigned char) c ;
+  unsigned int cc = (unsigned int) c ;
 
   exists[cc] = FNT_TRUE ;