diff --git a/samples/bpf/bpf_helpers.h b/samples/bpf/bpf_helpers.h
index 699ed8d..f531a0b 100644
--- a/samples/bpf/bpf_helpers.h
+++ b/samples/bpf/bpf_helpers.h
@@ -23,6 +23,8 @@
 	(void *) BPF_FUNC_trace_printk;
 static void (*bpf_tail_call)(void *ctx, void *map, int index) =
 	(void *) BPF_FUNC_tail_call;
+static unsigned long long (*bpf_get_smp_processor_id)(void) =
+	(void *) BPF_FUNC_get_smp_processor_id;
 
 /* llvm builtin functions that eBPF C program may use to
  * emit BPF_LD_ABS and BPF_LD_IND instructions