diff --git a/pkg/lua/Makefile.lua b/pkg/lua/Makefile.lua
index 6294e58c0f5e95832b923f925feefd0a4c9c8408..b253234ba4378533696bfcfde98e32ff3f5206c2 100644
--- a/pkg/lua/Makefile.lua
+++ b/pkg/lua/Makefile.lua
@@ -6,6 +6,11 @@ endif
 
 CFLAGS += -DLUA_MAXCAPTURES=16 -DL_MAXLENNUM=50
 
+# Upstream has several of these warnings which will not be fixed: because it
+# would require a big refactor and because the lua developers do not accept
+# patches.
+CFLAGS += -Wno-cast-qual
+
 #    Enable these options to debug stack usage
 #          -Wstack-usage=128 -Wno-error=stack-usage=128