diff --git a/bird/Makefile b/bird/Makefile
index 5f8200c..eeb5106 100644
--- a/bird/Makefile
+++ b/bird/Makefile
@@ -161,6 +161,8 @@ endef
 
 CONFIGURE_ARGS += --with-linux-headers="$(LINUX_DIR)"
 
+TARGET_CFLAGS+=-std=gnu89
+
 define Build/Template
 
 $(STAMP_BUILT)-$(2): $(STAMP_PREPARED)