diff --git a/tools/expat/Makefile b/tools/expat/Makefile
index 697d3f60d1..246089d609 100644
--- a/tools/expat/Makefile
+++ b/tools/expat/Makefile
@@ -18,6 +18,9 @@ HOST_BUILD_PARALLEL:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 
+HOST_CONFIGURE_VARS += \
+	CPPFLAGS="$(HOST_CFLAGS) -DXML_POOR_ENTROPY"
+
 define Host/Install
 	$(MAKE) -C $(HOST_BUILD_DIR) install
 endef