diff --git a/3rdparty/fonts/fnt.h b/3rdparty/fonts/fnt.h
index 7419489..a89b635 100644
--- a/3rdparty/fonts/fnt.h
+++ b/3rdparty/fonts/fnt.h
@@ -126,7 +126,7 @@ private:
 #endif
   }
 
-  float low_putch ( sgVec3 curpos, float pointsize, float italic, char c ) ;
+  float low_putch ( sgVec3 curpos, float pointsize, float italic, int c ) ;
 
   int loadTXF ( const SGPath& path, GLenum mag = GL_NEAREST,
                              GLenum min = GL_LINEAR_MIPMAP_LINEAR ) ;