diff --git a/code/makefile b/code/makefile
index caff7b2..08f4925 100644
--- a/code/makefile
+++ b/code/makefile
@@ -23,9 +23,11 @@ test.o  : test.f90 post.mod compact.mod
 	${compiler} -c ${flags} test.f90
 
 post.o post.mod: post.f90 compact.mod
+	rm -f post.mod
 	${compiler} -c ${flags} post.f90
 
 Compact.o compact.mod: Compact.f90
+	rm -f compact.mod
 	${compiler} -c ${flags} Compact.f90
 
 clean: