diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 5bfb1ce129f4..74a296cea21c 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -1537,6 +1537,7 @@ static void hw_collect_aux(struct cpu_hw_sf *cpuhw)
 	perf_aux_output_end(handle, size);
 	num_sdb = aux->sfb.num_sdb;
 
+	num_sdb = aux->sfb.num_sdb;
 	while (!done) {
 		/* Get an output handle */
 		aux = perf_aux_output_begin(handle, cpuhw->event);