diff --git a/drivers/snmp-ups.c b/drivers/snmp-ups.c
index 1d384548ff..dccf5e2e65 100644
--- a/drivers/snmp-ups.c
+++ b/drivers/snmp-ups.c
@@ -66,10 +66,27 @@
 #include "hpe-pdu-mib.h"
 
 /* Address API change */
-#ifndef usmAESPrivProtocol
+#if ( ! NUT_HAVE_LIBNETSNMP_usmAESPrivProtocol ) && ( ! defined usmAESPrivProtocol )
 #define usmAESPrivProtocol usmAES128PrivProtocol
 #endif
 
+#ifdef USM_PRIV_PROTO_AES_LEN
+# define NUT_securityPrivProtoLen USM_PRIV_PROTO_AES_LEN
+#else
+# ifdef USM_PRIV_PROTO_AES128_LEN
+#  define NUT_securityPrivProtoLen USM_PRIV_PROTO_AES128_LEN
+# else
+/* FIXME: Find another way to get the size of array(?) to avoid:
+ *   error: division 'sizeof (oid * {aka long unsigned int *}) / sizeof (oid {aka long unsigned int})' does not compute the number of array elements [-Werror=sizeof-pointer-div]
+ * See also https://bugs.php.net/bug.php?id=37564 for context
+ * which is due to most values in /usr/include/net-snmp/librarytransform_oids.h
+ * being defined as "oid[10]" or similar arrays, and "backwards compatibility"
+ * usmAESPrivProtocol name is an "oid *" pointer.
+ */
+#  define NUT_securityPrivProtoLen (sizeof(usmAESPrivProtocol)/sizeof(oid))
+# endif
+#endif
+
 static mib2nut_info_t *mib2nut[] = {
 	&apc,
 	&mge,
@@ -593,7 +610,7 @@ void nut_snmp_init(const char *type, const char *hostname)
 		}
 		else if (strcmp(privProtocol, "AES") == 0) {
 			g_snmp_sess.securityPrivProto = usmAESPrivProtocol;
-			g_snmp_sess.securityPrivProtoLen =  sizeof(usmAESPrivProtocol)/sizeof(oid);
+			g_snmp_sess.securityPrivProtoLen = NUT_securityPrivProtoLen;
 		}
 		else
 			fatalx(EXIT_FAILURE, "Bad SNMPv3 authProtocol: %s", authProtocol);
diff --git a/m4/nut_check_libnetsnmp.m4 b/m4/nut_check_libnetsnmp.m4
index 83b26330b7..06be25f3d3 100644
--- a/m4/nut_check_libnetsnmp.m4
+++ b/m4/nut_check_libnetsnmp.m4
@@ -75,6 +75,22 @@ if test -z "${nut_have_libnetsnmp_seen}"; then
 	if test "${nut_have_libnetsnmp}" = "yes"; then
 		LIBNETSNMP_CFLAGS="${CFLAGS}"
 		LIBNETSNMP_LIBS="${LIBS}"
+
+	AC_MSG_CHECKING([for defined usmAESPrivProtocol])
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+oid * pProto = usmAESPrivProtocol;
+],
+[]
+		)],
+		[AC_MSG_RESULT([yes])
+		 AC_DEFINE_UNQUOTED(NUT_HAVE_LIBNETSNMP_usmAESPrivProtocol, 1, [Variable or macro by this name is resolvable])
+		],
+		[AC_MSG_RESULT([no])
+		 AC_DEFINE_UNQUOTED(NUT_HAVE_LIBNETSNMP_usmAESPrivProtocol, 0, [Variable or macro by this name is not resolvable])
+		])
+
 	fi
 
 	dnl restore original CFLAGS and LIBS