diff --git a/src/ip_frag_tuner.c b/src/ip_frag_tuner.c
index b3cc8d8..a32a607 100644
--- a/src/ip_frag_tuner.c
+++ b/src/ip_frag_tuner.c
@@ -16,7 +16,7 @@ static struct bpftunable_desc descs[] = {
 { IP_FRAG_MAX_THRESHOLD, BPFTUNABLE_SYSCTL, "net.ipv4.ipfrag_high_thresh",
 	BPFTUNABLE_NAMESPACED, 1 },
 { IP6_FRAG_MAX_THRESHOLD, BPFTUNABLE_SYSCTL, "net.ipv6.ip6frag_high_thresh",
-	BPFTUNABLE_NAMESPACED, 1 },
+	BPFTUNABLE_NAMESPACED | BPFTUNABLE_OPTIONAL, 1 },
 };
 
 static struct bpftunable_scenario scenarios[] = {