--- a/Makefile
+++ b/Makefile
@@ -74,7 +74,7 @@
 	ar rcs liblz4.a lz4.o lz4hc.o
 
 liblz4.so: lz4.c lz4hc.c lz4.h
-	$(CC) -shared -fPIC -Wl,--soname=liblz4.so.1 $(CFLAGS) -o $@
+	$(CC) -shared -fPIC -Wl,--soname=liblz4.so.1 $(CFLAGS) lz4.c lz4hc.c -o $@
 
 clean:
 	@rm -f core *.o *.a *.so $(DISTRIBNAME)