diff --git a/makefile b/makefile
index 86d90b5fe8d887c468fc5cb37f12e596d548144e..daec48379ae863ce1bf202f10c082ce4817f4c7a 100644
--- a/makefile
+++ b/makefile
@@ -10,11 +10,12 @@ ifeq ($(COMPILER),gnu)
   FC = gfortran
 endif 
 
-OBJ_F90 = inputdata.o param.o prmt.o 
+OBJ_F90 = inputdata.o param.o prmt.o
 OBJ_F = DRAG.o drag3.o
+OBJ = $(OBJ_F90) $(OBJ_F)
 
-$(RUN): $(OBJ_F90) $(OBJ_F)
-	$(FC) $(FC_KEYS) $(OBJ_F90) $(OBJ_F) -o $(RUN)
+$(RUN): $(OBJ)
+	$(FC) $(FC_KEYS) $(OBJ) -o $(RUN)
 
 $(OBJ_F90): %.o: %.f90
 	$(FC) $(FC_KEYS) -o $@ -c $<