diff --git a/Makefile b/Makefile
index 5f24696..476e0fb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,14 @@
 HS_SRCS = $(shell find . -name 'day*.hs')
 HS_TARGETS = $(HS_SRCS:.hs=)
+HI_TARGETS = $(HS_SRCS:.hs=.hi)
+O_TARGETS = $(HS_SRCS:.hs=.o)
 
 all: $(HS_TARGETS)
 
 %: %.hs
 	ghc $<
 
-clean: $(HS_TARGETS)
-	rm -rf $(HS_TARGETS)
+clean:
+	rm -rf $(HS_TARGETS) $(HI_TARGETS) $(O_TARGETS)
 
 .PHONY: all clean
\ No newline at end of file