diff --git a/src/Makefile b/src/Makefile
index d0bac7a..e7a02dd 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -15,13 +15,13 @@ all:	src
 src:	gvalue
 
 gvalue:	gvalue.o mod_constants.o mod_file_utils.o
-gvalue: class_grid.o class_orbital.o class_work.o class_mixture.o
+gvalue: class_grid.o class_medium.o class_work.o class_mixture.o
 	$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 gvalue.o: mod_constants.o mod_file_utils.o
-gvalue.o: class_grid.o class_orbital.o
-class_orbital.o: mod_file_utils.o mod_constants.o class_grid.o class_mixture.o
-class_work.o: mod_file_utils.o class_orbital.o class_grid.o class_mixture.o
+gvalue.o: class_grid.o class_medium.o
+class_medium.o: mod_file_utils.o mod_constants.o class_grid.o class_mixture.o
+class_work.o: mod_file_utils.o class_medium.o class_grid.o class_mixture.o
 
 clean:
 	$(RM) -f *~
diff --git a/src/class_orbital.f90 b/src/class_medium.f90
similarity index 100%
rename from src/class_orbital.f90
rename to src/class_medium.f90