Should be mat4 or mat4x4, not mat44
@ -1590,7 +1590,7 @@ static const char *stbvox_vertex_program =
"uniform vec3 normal_table[32];\n"
#ifndef STBVOX_CONFIG_OPENGL_MODELVIEW
"uniform mat44 model_view;\n"
"uniform mat4x4 model_view;\n"
#endif
// fragment output data