diff --git a/Makefile b/Makefile
index 2be8a86..3c1c22d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,15 +3,6 @@ LDLIBS = -lm
 
 all: check example1 example2 example3 example4
 
-sigmoid: CFLAGS += -Dgenann_act=genann_act_sigmoid_cached
-sigmoid: all
-
-threshold: CFLAGS += -Dgenann_act=genann_act_threshold
-threshold: all
-
-linear: CFLAGS += -Dgenann_act=genann_act_linear
-linear: all
-
 test: test.o genann.o
 
 check: test
@@ -30,6 +21,6 @@ clean:
 	$(RM) test example1 example2 example3 example4 *.exe
 	$(RM) persist.txt
 
-.PHONY: sigmoid threshold linear clean
+.PHONY: clean
 
 -include $(wildcard *.d)