diff --git a/src/main.cc b/src/main.cc
index 82135fbeb..67986c8a7 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -136,41 +136,41 @@ struct user_data_t
 };
 
 static void
-move_to (float to_x, float to_y, user_data_t &user_data)
+move_to (float to_x, float to_y, user_data_t *user_data)
 {
-  fprintf (user_data.f, "M%g,%g", to_x, user_data.ascender - to_y);
+  fprintf (user_data->f, "M%g,%g", to_x, user_data->ascender - to_y);
 }
 
 static void
-line_to (float to_x, float to_y, user_data_t &user_data)
+line_to (float to_x, float to_y, user_data_t *user_data)
 {
-  fprintf (user_data.f, "L%g,%g", to_x, user_data.ascender - to_y);
+  fprintf (user_data->f, "L%g,%g", to_x, user_data->ascender - to_y);
 }
 
 static void
 quadratic_to (float control_x, float control_y,
 	      float to_x, float to_y,
-	      user_data_t &user_data)
+	      user_data_t *user_data)
 {
-  fprintf (user_data.f, "Q%g,%g %g,%g", control_x, user_data.ascender - control_y,
-					to_x, user_data.ascender - to_y);
+  fprintf (user_data->f, "Q%g,%g %g,%g", control_x, user_data->ascender - control_y,
+					to_x, user_data->ascender - to_y);
 }
 
 static void
 cubic_to (float control1_x, float control1_y,
 	  float control2_x, float control2_y,
 	  float to_x, float to_y,
-	  user_data_t &user_data)
+	  user_data_t *user_data)
 {
-  fprintf (user_data.f, "C%g,%g %g,%g %g,%g", control1_x, user_data.ascender - control1_y,
-					       control2_x, user_data.ascender - control2_y,
-					       to_x, user_data.ascender - to_y);
+  fprintf (user_data->f, "C%g,%g %g,%g %g,%g", control1_x, user_data->ascender - control1_y,
+					       control2_x, user_data->ascender - control2_y,
+					       to_x, user_data->ascender - to_y);
 }
 
 static void
-close_path (user_data_t &user_data)
+close_path (user_data_t *user_data)
 {
-  fprintf (user_data.f, "Z");
+  fprintf (user_data->f, "Z");
 }
 
 static void