diff --git a/src/emu/cpu.c b/src/emu/cpu.c
index 9ba2d40..def6ad2 100644
--- a/src/emu/cpu.c
+++ b/src/emu/cpu.c
@@ -331,10 +331,7 @@ cpu_migrate_thread(struct cpu *cpu, struct thread *thread, struct cpu *newcpu)
 }
 
 struct chan *
-cpu_get_th_chan(struct cpu *cpu, enum track_th trackmode)
+cpu_get_th_chan(struct cpu *cpu)
 {
-	if (trackmode != TRACK_TH_RUN)
-		die("cpu tracking must be running");
-
 	return &cpu->chan[CPU_CHAN_THRUN];
 }
diff --git a/src/emu/cpu.h b/src/emu/cpu.h
index 7bf5aec..e7abb85 100644
--- a/src/emu/cpu.h
+++ b/src/emu/cpu.h
@@ -78,7 +78,7 @@ USE_RET int cpu_add_thread(struct cpu *cpu, struct thread *thread);
 USE_RET int cpu_remove_thread(struct cpu *cpu, struct thread *thread);
 USE_RET int cpu_migrate_thread(struct cpu *cpu, struct thread *thread, struct cpu *newcpu);
 
-USE_RET struct chan *cpu_get_th_chan(struct cpu *cpu, enum track_th mode);
+USE_RET struct chan *cpu_get_th_chan(struct cpu *cpu);
 USE_RET struct pcf_value *cpu_add_to_pcf_type(struct cpu *cpu, struct pcf_type *type);
 
 #endif /* CPU_H */
diff --git a/src/emu/model_cpu.c b/src/emu/model_cpu.c
index 22a5d2d..cda75c4 100644
--- a/src/emu/model_cpu.c
+++ b/src/emu/model_cpu.c
@@ -87,7 +87,12 @@ connect_cpu(struct emu *emu, struct cpu *scpu, int id)
 		/* Choose select CPU channel based on tracking mode (only
 		 * TRACK_TH_RUN allowed, as active may cause collisions) */
 		int mode = chan_spec->track[i];
-		struct chan *sel = cpu_get_th_chan(scpu, mode);
+		if (mode != TRACK_TH_RUN) {
+			err("only TRACK_TH_RUN allowed");
+			return -1;
+		}
+
+		struct chan *sel = cpu_get_th_chan(scpu);
 
 		int64_t nthreads = emu->system.nthreads;
 		if (track_set_select(track, sel, NULL, nthreads) != 0) {