diff --git a/agent/mibgroup/mibII/icmp.h b/agent/mibgroup/mibII/icmp.h
index 9c8d34a..90f17f3 100644
--- a/agent/mibgroup/mibII/icmp.h
+++ b/agent/mibgroup/mibII/icmp.h
@@ -16,6 +16,7 @@ config_arch_require(freebsd9,  mibII/kernel_sysctl)
 config_arch_require(freebsd10, mibII/kernel_sysctl)
 config_arch_require(freebsd11, mibII/kernel_sysctl)
 config_arch_require(freebsd12, mibII/kernel_sysctl)
+config_arch_require(kfreebsd,  mibII/kernel_sysctl)
 config_arch_require(netbsd,    mibII/kernel_netbsd)
 config_arch_require(netbsdelf, mibII/kernel_netbsd)
 config_arch_require(openbsd4,  mibII/kernel_sysctl)
diff --git a/agent/mibgroup/mibII/kernel_sysctl.c b/agent/mibgroup/mibII/kernel_sysctl.c
index 166f664..8ea87f8 100644
--- a/agent/mibgroup/mibII/kernel_sysctl.c
+++ b/agent/mibgroup/mibII/kernel_sysctl.c
@@ -14,6 +14,12 @@
 #include <netinet/icmp_var.h>
 #include <netinet/icmp6.h>
 
+#if defined(__FreeBSD_kernel__) && defined(__GLIBC__)
+/* definitions unavailable in GNU libc's icmp6.h */
+#define ICMP6_MAXTYPE		201
+#define ICMPV6CTL_STATS		1
+#endif
+
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
 #include <net-snmp/agent/net-snmp-agent-includes.h>