diff --git a/net/zerotier/Makefile b/net/zerotier/Makefile
index bc19eaa7c2..41975d505c 100644
--- a/net/zerotier/Makefile
+++ b/net/zerotier/Makefile
@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zerotier
 PKG_VERSION:=1.14.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/zerotier/ZeroTierOne/tar.gz/$(PKG_VERSION)?
@@ -62,6 +62,9 @@ endef
 TARGET_CFLAGS += -Wl,-z,noexecstack
 TARGET_LDFLAGS += -Wl,--as-needed -Wl,-z,noexecstack
 
+# Prevent `-isystem ext` from causing the wrong miniupnpc header to be used (OpenWrt packages issue - 18019)
+TARGET_CFLAGS += -isystem $(STAGING_DIR)/usr/include
+
 define Package/zerotier/conffiles
 /etc/config/zerotier
 endef