diff --git a/src/radius/radius.c b/src/radius/radius.c
index defcd92..407e4f8 100644
--- a/src/radius/radius.c
+++ b/src/radius/radius.c
@@ -538,7 +538,8 @@
 
 
 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
-			      size_t secret_len)
+			      size_t secret_len,
+			      int require_message_authenticator)
 {
 	const u8 *addr[4];
 	size_t len[4];
@@ -577,7 +578,11 @@
 	}
 
 	if (attr == NULL) {
-		/* Message-Authenticator is MAY; not required */
+		if (require_message_authenticator) {
+			wpa_printf(MSG_WARNING,
+				   "Missing Message-Authenticator attribute in RADIUS message");
+			return 1;
+		}
 		return 0;
 	}
 
diff --git a/src/radius/radius.h b/src/radius/radius.h
index cba2b91..cd510d2 100644
--- a/src/radius/radius.h
+++ b/src/radius/radius.h
@@ -242,7 +242,8 @@
 int radius_msg_verify_acct_req(struct radius_msg *msg, const u8 *secret,
 			       size_t secret_len);
 int radius_msg_verify_das_req(struct radius_msg *msg, const u8 *secret,
-			       size_t secret_len);
+			      size_t secret_len,
+			      int require_message_authenticator);
 struct radius_attr_hdr * radius_msg_add_attr(struct radius_msg *msg, u8 type,
 					     const u8 *data, size_t data_len);
 struct radius_msg * radius_msg_parse(const u8 *data, size_t len);
diff --git a/src/radius/radius_das.c b/src/radius/radius_das.c
index b7d991b..8a3d7e0 100644
--- a/src/radius/radius_das.c
+++ b/src/radius/radius_das.c
@@ -23,6 +23,7 @@
 	struct hostapd_ip_addr client_addr;
 	unsigned int time_window;
 	int require_event_timestamp;
+	int require_message_authenticator;
 	void *ctx;
 	enum radius_das_res (*disconnect)(void *ctx,
 					  struct radius_das_attrs *attr);
@@ -234,9 +235,11 @@
 		radius_msg_dump(msg);
 
 	if (radius_msg_verify_das_req(msg, das->shared_secret,
-				       das->shared_secret_len)) {
-		wpa_printf(MSG_DEBUG, "DAS: Invalid authenticator in packet "
-			   "from %s:%d - drop", abuf, from_port);
+				       das->shared_secret_len,
+				       das->require_message_authenticator)) {
+		wpa_printf(MSG_DEBUG,
+			   "DAS: Invalid authenticator or Message-Authenticator in packet from %s:%d - drop",
+			   abuf, from_port);
 		goto fail;
 	}
 
@@ -362,6 +365,8 @@
 
 	das->time_window = conf->time_window;
 	das->require_event_timestamp = conf->require_event_timestamp;
+	das->require_message_authenticator =
+		conf->require_message_authenticator;
 	das->ctx = conf->ctx;
 	das->disconnect = conf->disconnect;
 
diff --git a/src/radius/radius_das.h b/src/radius/radius_das.h
index ce731d4..9863fdc 100644
--- a/src/radius/radius_das.h
+++ b/src/radius/radius_das.h
@@ -44,6 +44,7 @@
 	const struct hostapd_ip_addr *client_addr;
 	unsigned int time_window;
 	int require_event_timestamp;
+	int require_message_authenticator;
 	void *ctx;
 	enum radius_das_res (*disconnect)(void *ctx,
 					  struct radius_das_attrs *attr);