diff --git a/ccid/Makefile b/ccid/Makefile
index cd8321f..2194180 100644
--- a/ccid/Makefile
+++ b/ccid/Makefile
@@ -1,6 +1,6 @@
 CFLAGS=-Wall -g
 
-ccid_functionfs: ccid_main_functionfs.o ccid_proto.o ccid_device.o
+ccid_functionfs: ccid_main_functionfs.o ccid_proto.o ccid_device.o ccid_slot_sim.o
 	$(CC) $(CFLAGS) -lasan -losmocore -ltalloc -laio -o $@ $^
 
 %.o: %.c