diff --git a/sys/netatalk/aarp.c b/sys/netatalk/aarp.c
index b4370973e85..abe66571d3a 100644
--- a/sys/netatalk/aarp.c
+++ b/sys/netatalk/aarp.c
@@ -167,6 +167,9 @@ aarpwhohas( struct arpcom *ac, struct sockaddr_at *sat )
 		sizeof( eh->ether_dhost ));
 	eh->ether_type = htons(sizeof(struct llc) + sizeof(struct ether_aarp));
 	M_PREPEND( m, sizeof( struct llc ), M_TRYWAIT );
+	if ( m == NULL ) {
+	    return;
+	}
 	llc = mtod( m, struct llc *);
 	llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 	llc->llc_control = LLC_UI;
@@ -581,6 +584,9 @@ aarpprobe( void *arg )
 	eh->ether_type = htons( sizeof( struct llc ) +
 		sizeof( struct ether_aarp ));
 	M_PREPEND( m, sizeof( struct llc ), M_TRYWAIT );
+	if ( m == NULL ) {
+	    return;
+	}
 	llc = mtod( m, struct llc *);
 	llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 	llc->llc_control = LLC_UI;
diff --git a/sys/netatalk/ddp_output.c b/sys/netatalk/ddp_output.c
index f15914be2bb..5f7874da38a 100644
--- a/sys/netatalk/ddp_output.c
+++ b/sys/netatalk/ddp_output.c
@@ -56,6 +56,8 @@ ddp_output( struct mbuf *m, struct socket *so)
 #endif
 
     M_PREPEND( m, sizeof( struct ddpehdr ), M_TRYWAIT );
+    if ( m == NULL )
+	return( ENOBUFS );
 
     deh = mtod( m, struct ddpehdr *);
     deh->deh_pad = 0;