diff --git a/ccid_host/ccid_main_functionfs.c b/ccid_host/ccid_main_functionfs.c
index 5c0bc3b..d45a936 100644
--- a/ccid_host/ccid_main_functionfs.c
+++ b/ccid_host/ccid_main_functionfs.c
@@ -152,6 +152,7 @@
 
 #include "ccid_device.h"
 #include "ccid_slot_sim.h"
+extern struct ccid_slot_ops iso_fsm_slot_ops;
 
 #ifndef FUNCTIONFS_SUPPORTS_POLL
 #include <libaio.h>
@@ -528,7 +529,7 @@
 
 	signal(SIGUSR1, &signal_handler);
 
-	ccid_instance_init(&g_ci, &c_ops, &slotsim_slot_ops, &descriptors.fs_descs.ccid,
+	ccid_instance_init(&g_ci, &c_ops, &iso_fsm_slot_ops, &descriptors.fs_descs.ccid,
 			   data_rates, clock_freqs, "", &ufh);
 	ufh.ccid_handle = &g_ci;