diff --git a/3rdparty/fonts/fnt.cxx b/3rdparty/fonts/fnt.cxx
index cd4a1de..5207c9b 100644
--- a/3rdparty/fonts/fnt.cxx
+++ b/3rdparty/fonts/fnt.cxx
@@ -42,9 +42,9 @@ int fntTexFont::load ( const SGPath& path, GLenum mag, GLenum min )
 }
 
 float fntTexFont::low_putch ( sgVec3 curpos, float pointsize,
-                               float italic, char c )
+                               float italic, int c )
 {
-  unsigned int cc = (unsigned char) c ;
+  unsigned int cc = (unsigned int) c ;
 
   /* Auto case-convert if character is absent from font. */