diff --git a/main/fuelcen.c b/main/fuelcen.c
index c5e29f685..20ce4f5bf 100644
--- a/main/fuelcen.c
+++ b/main/fuelcen.c
@@ -795,9 +795,9 @@ void fuelcen_check_for_hoard_goal(segment *segp)
 #endif
 
 /*
- * reads an old_matcen_info structure from a PHYSFS_file
+ * reads an d1_matcen_info structure from a PHYSFS_file
  */
-void old_matcen_info_read(old_matcen_info *mi, PHYSFS_file *fp)
+void d1_matcen_info_read(d1_matcen_info *mi, PHYSFS_file *fp)
 {
 	mi->robot_flags[0] = PHYSFSX_readInt(fp);
 	mi->hit_points = PHYSFSX_readFix(fp);
@@ -839,7 +839,7 @@ void matcen_info_read_n_swap(matcen_info *mi, int n, int swap, PHYSFS_file *fp)
 {
 	int i;
 	
-	PHYSFS_read(fp, mi, sizeof(matcen_info), n);
+	PHYSFS_read(fp, mi, sizeof(*mi), n);
 	
 	if (swap)
 		for (i = 0; i < n; i++)
diff --git a/main/fuelcen.h b/main/fuelcen.h
index 6cc6314e6..a97a4f034 100644
--- a/main/fuelcen.h
+++ b/main/fuelcen.h
@@ -120,7 +120,7 @@ typedef struct  {
 	fix     interval;       // Interval between materialogrifizations
 	short   segnum;         // Segment this is attached to.
 	short   fuelcen_num;    // Index in fuelcen array.
-} __pack__ old_matcen_info;
+} __pack__ d1_matcen_info;
 
 typedef struct matcen_info {
 	int     robot_flags[2]; // Up to 64 different robots
@@ -150,9 +150,9 @@ extern fix EnergyToCreateOneRobot;
 void fuelcen_check_for_hoard_goal(segment *segp);
 
 /*
- * reads an old_matcen_info structure from a PHYSFS_file
+ * reads an d1_matcen_info structure from a PHYSFS_file
  */
-void old_matcen_info_read(old_matcen_info *mi, PHYSFS_file *fp);
+void d1_matcen_info_read(d1_matcen_info *mi, PHYSFS_file *fp);
 
 /*
  * reads a matcen_info structure from a PHYSFS_file
diff --git a/main/gamesave.c b/main/gamesave.c
index 07aef7af7..d57f5c863 100644
--- a/main/gamesave.c
+++ b/main/gamesave.c
@@ -975,8 +975,8 @@ int load_game_data(PHYSFS_file *LoadFile)
 
 	for (i = 0; i < Num_robot_centers; i++) {
 		if (game_top_fileinfo_version < 27) {
-			old_matcen_info m;
-			old_matcen_info_read(&m, LoadFile);
+			d1_matcen_info m;
+			d1_matcen_info_read(&m, LoadFile);
 			RobotCenters[i].robot_flags[0] = m.robot_flags[0];
 			RobotCenters[i].robot_flags[1] = 0;
 			RobotCenters[i].hit_points = m.hit_points;