diff --git a/CHANGES b/CHANGES
index 17bacd3..7f9e569 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+0.1.32-rc4 (2015-07-06)
+    - change: BIRD can't handle empty lists (NAME = []), so they are not
+      generated at all.
+
 0.1.32-rc3 (2015-07-01)
     - feature: option -s can be used to generate sequence numbers in IOS
       prefix-lists
diff --git a/bgpq3_printer.c b/bgpq3_printer.c
index 0b815f3..85bbf52 100644
--- a/bgpq3_printer.c
+++ b/bgpq3_printer.c
@@ -14,6 +14,8 @@
 #include "bgpq3.h"
 #include "sx_report.h"
 
+extern int debug_expander;
+
 int bgpq3_print_json_aspath(FILE* f, struct bgpq_expander* b);
 int bgpq3_print_bird_aspath(FILE* f, struct bgpq_expander* b);
 
@@ -357,7 +359,8 @@ int
 bgpq3_print_bird_aspath(FILE* f, struct bgpq_expander* b)
 {
 	int nc=0, i, j, k, empty=1;
-	fprintf(f, "%s = [", b->name?b->name:"NN");
+	char buffer[2048];
+	snprintf(buffer, sizeof(buffer), "%s = [", b->name?b->name:"NN");
 
 	for(k=0;k<65536;k++) {
 		if(!b->asn32s[k]) continue;
@@ -365,6 +368,9 @@ bgpq3_print_bird_aspath(FILE* f, struct bgpq_expander* b)
 		for(i=0;i<8192;i++) {
 			for(j=0;j<8;j++) {
 				if(b->asn32s[k][i]&(0x80>>j)) {
+					if(buffer[0])
+						fprintf(f, "%s", buffer);
+					buffer[0]=0;
 					if(!nc) {
 						fprintf(f, "%s%u", empty?"":",\n    ", k*65536+i*8+j);
 						empty = 0;
@@ -379,7 +385,8 @@ bgpq3_print_bird_aspath(FILE* f, struct bgpq_expander* b)
 			};
 		};
 	};
-	fprintf(f,"];\n");
+	if(!empty)
+		fprintf(f,"];\n");
 	return 0;
 };
 
@@ -611,10 +618,14 @@ bgpq3_print_json_prefixlist(FILE* f, struct bgpq_expander* b)
 int
 bgpq3_print_bird_prefixlist(FILE* f, struct bgpq_expander* b)
 {
-	fprintf(f,"%s = [",
-		b->name?b->name:"NN");
-	sx_radix_tree_foreach(b->tree,bgpq3_print_bird_prefix,f);
-	fprintf(f,"\n];\n");
+	if (!sx_radix_tree_empty(b->tree)) {
+		fprintf(f,"%s = [",
+			b->name?b->name:"NN");
+		sx_radix_tree_foreach(b->tree,bgpq3_print_bird_prefix,f);
+		fprintf(f,"\n];\n");
+	} else {
+		SX_DEBUG(debug_expander, "skip empty prefix-list in BIRD format\n");
+	};
 	return 0;
 };
 
diff --git a/configure b/configure
index c816722..94bdfc1 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for bgpq3 0.1.32-rc3.
+# Generated by GNU Autoconf 2.69 for bgpq3 0.1.32-rc4.
 #
 # Report bugs to <snar@snar.spb.ru>.
 #
@@ -579,8 +579,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='bgpq3'
 PACKAGE_TARNAME='bgpq3'
-PACKAGE_VERSION='0.1.32-rc3'
-PACKAGE_STRING='bgpq3 0.1.32-rc3'
+PACKAGE_VERSION='0.1.32-rc4'
+PACKAGE_STRING='bgpq3 0.1.32-rc4'
 PACKAGE_BUGREPORT='snar@snar.spb.ru'
 PACKAGE_URL=''
 
@@ -1187,7 +1187,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures bgpq3 0.1.32-rc3 to adapt to many kinds of systems.
+\`configure' configures bgpq3 0.1.32-rc4 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1248,7 +1248,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of bgpq3 0.1.32-rc3:";;
+     short | recursive ) echo "Configuration of bgpq3 0.1.32-rc4:";;
    esac
   cat <<\_ACEOF
 
@@ -1327,7 +1327,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-bgpq3 configure 0.1.32-rc3
+bgpq3 configure 0.1.32-rc4
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1495,7 +1495,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by bgpq3 $as_me 0.1.32-rc3, which was
+It was created by bgpq3 $as_me 0.1.32-rc4, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -3413,7 +3413,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by bgpq3 $as_me 0.1.32-rc3, which was
+This file was extended by bgpq3 $as_me 0.1.32-rc4, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -3475,7 +3475,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-bgpq3 config.status 0.1.32-rc3
+bgpq3 config.status 0.1.32-rc4
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.in b/configure.in
index f9d136d..da5531c 100644
--- a/configure.in
+++ b/configure.in
@@ -1,4 +1,4 @@
-AC_INIT(bgpq3,0.1.32-rc3,snar@snar.spb.ru)
+AC_INIT(bgpq3,0.1.32-rc4,snar@snar.spb.ru)
 AC_CONFIG_HEADER(config.h)
 AC_PROG_CC
 AC_PROG_INSTALL