diff --git a/Makefile b/Makefile
index 910e3e0..e794ddb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
-LEANIFY_SRC     := leanify.cpp main.cpp utils.cpp $(wildcard formats/*.cpp)
+LEANIFY_OBJ     := leanify.o main.o utils.o $(patsubst %.cpp,%.o,$(wildcard formats/*.cpp))
 LZMA_OBJ        := lib/LZMA/Alloc.o lib/LZMA/LzFind.o lib/LZMA/LzFindMt.o lib/LZMA/LzFindOpt.o lib/LZMA/LzmaDec.o lib/LZMA/LzmaEnc.o lib/LZMA/Threads.o
 MOZJPEG_OBJ     := lib/mozjpeg/jaricom.o lib/mozjpeg/jcapimin.o lib/mozjpeg/jcarith.o lib/mozjpeg/jcext.o lib/mozjpeg/jchuff.o lib/mozjpeg/jcmarker.o lib/mozjpeg/jcmaster.o lib/mozjpeg/jcomapi.o lib/mozjpeg/jcparam.o lib/mozjpeg/jcphuff.o lib/mozjpeg/jctrans.o lib/mozjpeg/jdapimin.o lib/mozjpeg/jdarith.o lib/mozjpeg/jdatadst.o lib/mozjpeg/jdatasrc.o lib/mozjpeg/jdcoefct.o lib/mozjpeg/jdhuff.o lib/mozjpeg/jdinput.o lib/mozjpeg/jdmarker.o lib/mozjpeg/jdphuff.o lib/mozjpeg/jdtrans.o lib/mozjpeg/jerror.o lib/mozjpeg/jmemmgr.o lib/mozjpeg/jmemnobs.o lib/mozjpeg/jsimd_none.o lib/mozjpeg/jutils.o
 PUGIXML_OBJ     := lib/pugixml/pugixml.o
 ZOPFLI_OBJ      := lib/zopfli/hash.o lib/zopfli/squeeze.o lib/zopfli/gzip_container.o lib/zopfli/katajainen.o lib/zopfli/zopfli_lib.o lib/zopfli/cache.o lib/zopfli/zlib_container.o lib/zopfli/util.o lib/zopfli/tree.o lib/zopfli/deflate.o lib/zopfli/blocksplitter.o lib/zopfli/lz77.o
 ZOPFLIPNG_OBJ   := lib/zopflipng/lodepng/lodepng.o lib/zopflipng/lodepng/lodepng_util.o lib/zopflipng/zopflipng_lib.o
 
-CFLAGS      += -Wall -Wextra -Wno-unused-parameter -Werror -O3 -msse2 -mfpmath=sse -flto
+CFLAGS      += -Wall -Werror -O3 -msse2 -mfpmath=sse -flto
 CPPFLAGS    += -I./lib
 CXXFLAGS    += $(CFLAGS) -std=c++17 -fno-rtti
 LDFLAGS     += -flto -lpthread
@@ -30,21 +30,23 @@ else
 endif
 
 ifeq ($(SYSTEM), Windows)
-    LEANIFY_SRC += fileio_win.cpp
+    LEANIFY_OBJ += fileio_win.o
 else
-    LEANIFY_SRC += fileio_linux.cpp
+    LEANIFY_OBJ += fileio_linux.o
 endif
 
-.PHONY:     leanify clean
+.PHONY:     leanify asan clean
 
-leanify:    $(LEANIFY_SRC) $(LZMA_OBJ) $(MOZJPEG_OBJ) $(PUGIXML_OBJ) $(ZOPFLI_OBJ) $(ZOPFLIPNG_OBJ)
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) $^ $(LDFLAGS) $(LDLIBS) -o $@
+leanify:    $(LEANIFY_OBJ) $(LZMA_OBJ) $(MOZJPEG_OBJ) $(PUGIXML_OBJ) $(ZOPFLI_OBJ) $(ZOPFLIPNG_OBJ)
+	$(CXX) $^ $(LDFLAGS) $(LDLIBS) -o $@
 
-$(LZMA_OBJ):    CFLAGS := $(filter-out -Wextra,$(CFLAGS))
-
-$(MOZJPEG_OBJ): CFLAGS := $(filter-out -Wextra,$(CFLAGS))
+$(LEANIFY_OBJ): CFLAGS += -Wextra -Wno-unused-parameter
 
 $(ZOPFLI_OBJ):  CFLAGS += -Wno-unused-function
 
+asan: CFLAGS += -g -fsanitize=address -fno-omit-frame-pointer
+asan: LDFLAGS := -fsanitize=address $(filter-out -s,$(LDFLAGS))
+asan: leanify
+
 clean:
-	rm -f $(LZMA_OBJ) $(MOZJPEG_OBJ) $(PUGIXML_OBJ) $(ZOPFLI_OBJ) $(ZOPFLIPNG_OBJ) leanify
+	rm -f $(LEANIFY_OBJ) $(LZMA_OBJ) $(MOZJPEG_OBJ) $(PUGIXML_OBJ) $(ZOPFLI_OBJ) $(ZOPFLIPNG_OBJ) leanify