diff --git a/package/olsr/olsr.mk b/package/olsr/olsr.mk
index 97088f33b3..fff7b34335 100644
--- a/package/olsr/olsr.mk
+++ b/package/olsr/olsr.mk
@@ -15,6 +15,7 @@ OLSR_PLUGINS = arprefresh bmf dot_draw dyn_gw dyn_gw_plain httpinfo jsoninfo \
 OLSR_PLUGINS += $(if $(BR2_PACKAGE_QUAGGA),quagga)
 OLSR_LICENSE = BSD-3c LGPLv2.1+
 OLSR_LICENSE_FILES = license.txt lib/pud/nmealib/LICENSE
+OLSR_DEPENDENCIES = host-flex host-bison
 
 define OLSR_BUILD_CMDS
 	$(TARGET_CONFIGURE_OPTS) $(MAKE) ARCH=$(KERNEL_ARCH) -C $(@D) olsrd