diff --git a/package/ipsec-tools/ipsec-tools.mk b/package/ipsec-tools/ipsec-tools.mk
index ddae9a75f3..8672272538 100644
--- a/package/ipsec-tools/ipsec-tools.mk
+++ b/package/ipsec-tools/ipsec-tools.mk
@@ -9,7 +9,7 @@ IPSEC_TOOLS_SOURCE = ipsec-tools-$(IPSEC_TOOLS_VERSION).tar.bz2
 IPSEC_TOOLS_SITE = http://sourceforge.net/projects/ipsec-tools/files/ipsec-tools/$(IPSEC_TOOLS_VERSION)
 IPSEC_TOOLS_INSTALL_STAGING = YES
 IPSEC_TOOLS_MAKE = $(MAKE1)
-IPSEC_TOOLS_DEPENDENCIES = openssl flex host-flex
+IPSEC_TOOLS_DEPENDENCIES = openssl flex host-flex host-bison
 # we patch configure.ac
 IPSEC_TOOLS_AUTORECONF = YES