diff --git a/makefile b/makefile
index 0cbd4ef..8dadabb 100644
--- a/makefile
+++ b/makefile
@@ -21,7 +21,7 @@ ex-4/bin/main: ex-4/main.c
 ex-5/bin/%: ex-5/%.c
 	$(CCOMPILE)
 
-ex-6/bin/main: ex-6/rl.c ex-6/fft.c
+ex-6/bin/main: ex-6/main.c ex-6/rl.c ex-6/fft.c
 	$(CCOMPILE)
 
 ex-7/bin/main: ex-7/main.c ex-7/common.c ex-7/fisher.c ex-7/percep.c