diff --git a/tools/flex/Makefile b/tools/flex/Makefile
index 760721a16f..1398b1ae51 100644
--- a/tools/flex/Makefile
+++ b/tools/flex/Makefile
@@ -13,6 +13,7 @@ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/westes/flex/releases/download/v$(PKG_VERSION)/
 PKG_HASH:=e87aae032bf07c26f85ac0ed3250998c37621d95f8bd748b31f15b33c45ee995
 
+HOST_FIXUP:=autoreconf
 HOST_BUILD_PARALLEL:=1
 
 include $(INCLUDE_DIR)/host-build.mk
diff --git a/tools/flex/patches/100-disable-tests-docs.patch b/tools/flex/patches/100-disable-tests-docs.patch
index f298bc911d..f7097f2127 100644
--- a/tools/flex/patches/100-disable-tests-docs.patch
+++ b/tools/flex/patches/100-disable-tests-docs.patch
@@ -1,8 +1,8 @@
 --- a/Makefile.am
 +++ b/Makefile.am
-@@ -45,10 +45,7 @@ EXTRA_DIST = \
+@@ -43,10 +43,7 @@ EXTRA_DIST = \
+ 
  SUBDIRS = \
- 	lib \
  	src \
 -	doc \
 -	examples \