diff --git a/bpf.h b/bpf.h
index e4897e2..60f4d7b 100644
--- a/bpf.h
+++ b/bpf.h
@@ -114,7 +114,7 @@
 
 #define MAX_BPF_LABEL_LEN 32
 
-#define BPF_LABELS_MAX 256
+#define BPF_LABELS_MAX 512	/* Each syscall could have an argument block. */
 struct bpf_labels {
 	int count;
 	struct __bpf_label {